Decision inputs
- Design life and qualification interval
- Temperature and radiation environment
- Seismic and LOCA duty
- Material and qualification requirements
APPLICATION SOLUTION
Nuclear component preload & support
Nuclear components use disc springs for tube support plates, snubbers and critical bolting to retain preload long-term with thermal compensation; this entry page lists nuclear-grade decision points.
ENGINEERING PROBLEM
Over long unmanned intervals with temperature and radiation, preload elements must retain function and meet nuclear-grade requirements.
BOUNDARY
This page describes a decision pattern and does not promise size or performance for another operating condition.
Solution pattern
- Slotted disc springs support tube plates compensating thermal growth
- Snubbers constrain under seismic events via spring systems
- Critical bolts keep preload with disc spring washers
Key risks
- Relaxation from irradiation and thermal aging
- Seismic over-travel
- Inaccessible for maintenance
Verification plan
- Qualification testing (seismic/LOCA/aging)
- Long-term preload retention verification
- In-service inspection procedures
Source-backed correspondences
| Summary | Load | Travel | Source |
|---|---|---|---|
| 核电预紧——按preload目标预选产品族；场景摘要仅供决策参考，不构成对其他工况的产品承诺。 | 按预紧目标 | 补偿行程 | Source ↗ |
Evidence (library locators)
Every technical claim traces to a specific asset version and page; restricted sources show locator metadata only.
- 191 EPRI NP 5697 Valve Stem Packing Improvements 核阀填料改进 1988 PDF p.22 · mechanism(internal source; excerpt not public)
- 2026 Machines Nuclear Reheat Valve Coned Disc Spring Optimization PDF p.1 · mechanism(internal source; excerpt not public)
Asset details → · access method in preparation
- 140 2021 ANE ISU AGN201M CRDM Spring Ejection Redesign pdf PDF p.4 · mechanism(internal source; excerpt not public)
- 192 EP 0138477 Improved reactor internals hold down spring 堆内构件压紧 Westingh PDF p.2 · mechanism(internal source; excerpt not public)
- 140 2021 ANE ISU AGN201M CRDM Spring Ejection Redesign pdf PDF p.9 · numeric(internal source; excerpt not public)
- 140 2021 ANE ISU AGN201M CRDM Spring Ejection Redesign pdf PDF p.10 · numeric(internal source; excerpt not public)
- 191 EPRI NP 5697 Valve Stem Packing Improvements 核阀填料改进 1988 PDF p.6 · numeric(internal source; excerpt not public)
- 193 US4671923 Holddown spring retention assembly 压紧弹簧保持组件 PDF p.6 · numeric(internal source; excerpt not public)
- 194 AECL 5550 Solving the problem of valve stem leakage CANDU 阀杆泄漏治理 1976 PDF p.6 · numeric(internal source; excerpt not public)
- 2021 ANE ISU AGN201M CRDM Spring Ejection Redesign PDF p.9 · numeric(internal source; excerpt not public)
- 2026 Machines Nuclear Reheat Valve Coned Disc Spring Optimization PDF p.1 · numeric(internal source; excerpt not public)
Asset details → · access method in preparation
Cases illustrate decisions and do not constitute a specification promise for any other operating condition.
ENGINEERING REVIEW