ML17300A541
| ML17300A541 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 09/19/1986 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML17300A540 | List: |
| References | |
| GL-83-28, TAC-59163, TAC-61838, TAC-64252, NUDOCS 8609260067 | |
| Download: ML17300A541 (6) | |
Text
PALO SAFETY EVALUATION REPORT GENERIC R
M (PART 1)
E
)
DOCKET NOS. 50-528/529/530 g2 $ 3 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 circuit 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 coin-cidentally 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
)
1 all licensees of operating reactors, applicants for an operating license, and holders of construction permits to respond to generic issues raised by the analyses of these two ATWS events.
8609260067 860919 PDR ADOCK 05000528 P
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This report is an evaluation of the response submitted by Arizona Public Service
- Company, the licensee/applicant for the Palo Verde Nuclear Generating Station, Units 1,2,3, 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/applicant 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 are identified as safety-related on documents, procedures, and information handling systems used in the plant to control safety-related activities, in-cluding maintenance, work orders, and parts replacement.
EVALUATION The licensee/applicant for the Palo Verde Nuclear Generating Station, Units 1,2,3 responded to the requirements of Item 2.1 (Part
- 1) with a submittal dated November 3, 1983 The licensee/applicant stated in this submittal 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/applicant further stated that maintenance activities and work orders
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involving safety-related components are designated as safety-related on associ-ated documents and administrative controls require procurement of replacement parts to be conducted according to safety-related procedures.
CONCLUSION Based on our review of these responses, we find the licensee's/applicant's statements confirm that a program exists for identifying, classifying and treat-ing 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 ATMS Events (Generic Letter 83-28)," July 8, 1983.
2.
- Letter, E. E. VanBrunt, Jr., Arizona Public Service Co., to G. Knighton, NRC, November 3, 1983.
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