ML17285A096
| ML17285A096 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 11/30/1988 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML17285A095 | List: |
| References | |
| GL-83-28, NUDOCS 8812080121 | |
| Download: ML17285A096 (5) | |
Text
E N
DOCKET RP). 50-397 SAFETY EVALUATION REPORT GENERIC PART 1)
N S)
INTRODUCTION AND
SUMMARY
On February 25, 1983, both of the scram circuit breakers at Unit 1 of the Salem Nuclear Power Plant failed to open upon an automatic reactor trip signal from the reactor protection system.
This incident was terminated manually by the operator about 30 seconds after the initiation of the automatic trip signal.
The failure of the circu'it breakers was determined to be related to the sticking of the undervoltage trip attachment.
Prior to this incident, on February 22, 1983, at Unit 1 of the Salem Nuclear Power Plant, an automatic trip signal was generated based on steam generator low-low level during plant start-up.
In this case, the reactor was tripped manually by the operator almost coincidentally with the automatic trip.
Following these incidents, on February 28, 1983, the NRC Executive Director for Operations (EDO), directed the staff to investigate and report on the generic implications of these occurrences at Unit 1 of the Salem Nuclear Power Plant.
The results of the staff's inquiry into the generic implications of the Salem unit incidents are reported in NUREG-1000, "Generic Implications of the ATWS Events at the Salem Nuclear Power Plant.
" As a result of this investigation, the commission (NRC) requested (by Generic Letter 83-28 dated July 8, 1983
) all licensees of operating reactors, applicants for an 1
operating license, and holders of construction permits to respond to generic issues raised by the analyses of these two ATMS events.
SSi20SOl2l SS1i30 PDR ADOCK 05000397 P,
This report is an evaluation of the response submitted by Washington Public Power Supply Systems, the licensee for the WNP-2, for Item 2.1 (Part 1) of Generic Letter 83-28.
The actual documents reviewed as part of this evaluation are listed in the references at the end of the report.
Item 2.1 (Part
- 1) requires the licensee to confirm that all Reactor Trip System components are identified, classified and treated as safety-related as indicated in the following statement:
Licensees and applicants shall confirm that all components whose functioning is required to trip the reactor is identified as safety-related on documents, procedures, and information handling systems used in the plant to control safety-related activities, including maintenance, work orders, and parts replacement.
I EVALUATION
+,r,
~
The licensee for the WNP-2 responded to the requirements of Item 2. 1 (Part I) with submittals dated November 18, 1983 and May 17, 1985.
The licensee stated in these submittals that all components that are required to perform the reactor trip function were reviewed to verify that these components are classified as safety-related equipment.
The licensee fur ther stated that these items are included in the WNP-2 class IE (CIE) or safety-related mechanical (SRM) lists and form a subset of the Master Equipment List (MEL) which is the controlling document for safety-related activities.
I
CONCLUSION Based on our review of these responses, we find the licensees statements confirm that a program exists for identifying, classifying and treating components that are required for performance of the reactor trip function as safety related.
This program meets the requirements of Item 2.1 (Part 1) of the Generic Letter 83-28, and is therefore acceptable.
REFERENCES 1.
NRC Letter, D.
G. Eisenhut to all Licensees of Operating Reactors, Applicants for Operating License, and Holders of Construction Permits, "Required Actions Based on Generic Implications of Salem ATWS Events (Generic Letter 83-28)," July 8, 1983.
2.
- Letter, G.
C. Sorensen, Washington Public Power Supply system to A.
Schwencer, NRC, November 18, 1983.
,3.
- Letter, G.
G. Sorensen, Washington Public Power Supply System to W. R.
- Butler, NRC, May 17, 1985.