ML18348A415
| ML18348A415 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 07/12/1977 |
| From: | Hoffman D Consumers Power Co |
| To: | James Keppler NRC/RGN-III |
| References | |
| IEC-77-001 | |
| Download: ML18348A415 (3) | |
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consumers Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201
- Area Code 517 788-0550 July l2, l977 Mr James G Keppler Office of Inspection and Enforcement Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-255, LICENSE DPR PALISADES PLANT - ADDI'rIONAL INFORMATIOi'.~
RELATING TO IE BULLETIN 77-01 Your letter of June 10, 1977 requested additional information relating to IE Bulletin 77-01 which dealt with the use of pneumatic time delay relays in safety-related systems.
The responses to your inquiries are as follows:
Question l "Date by which relays will be replaced."
J\\esponse 1 During the scheduled two-week Technical Specification testing outage in September 1977 (if the new relays are available) or the refueling outage January 1978.
Question 2 11Action taken in the interim to assure proper relay operation."
Resuonse 2 Relay No PCX/0216A P-55A PCX/02l6B P-55B PCX/02l6C P-55C 62-1105 62-1206 62-1205 P-55C P-55B P-55A Action Taken Proper operation is checked each time a charging pump is started.
All pumps are tested monthly by Technical Specification Surveillance Procedure No M0-20, Rev 6.
Proper operation is checked each time a charging pump is started. All pumps are tested monthly by Technical Specification Surveillance Procedure No M0-20, Rev 6.
JUL 14 1977
i, 2
Relay No PCX/0218A P-55A PCX/0218B P-55B PCX/0218C P-55C 162-5 162-6 162-107 162-213 362/DSl 362/DS2 362/DS3 362/DS4 162-105 162-106 162-202 162-203 guest ion 3 "Type of relays Response 3 Action Taken If this time delay relay failed to operate, the charging pump would continue to run and not trip on low suction.
Proper operation is checked by start-up transformer 1-2 undervoltage.
This is tested by the refueling Technical Specification Surveillance Procedure R0-8, Rev 5.
Com-pleted last refueling outage.
These time delay relays are operated by the 2400 V bus transfer (instant) initiating relays (386B, 386C or 386P).
The last operation of 386P and 386C was April 7, 1977.
Proper operation is checked by start-up transformer 1-2 undervoltage.
This is tested by the refueling Technical Specification Surveillance Procedure R0-8, Rev 5.
Com-pleted last refueling outage.
Proper operation is checked by manual transfer of lC and lD bus feeder breakers each time the unit is removed and returned to service.
Last outage May 14, 1977.
which will be used as replacements for the present relays."
Replacement relays will be Agastat 7000 Series Pneumatic Time Delay Relays with plus or minus five percent repeat accuracy.
guestion 4 "If the replacement relays are pneumatic, what is your basis for concluding that they will function properly throughout plant life, or what your plans are to assure. satisfactory operation throughout plant life?"
Response 4 The Nuclear Plant Reliability Data System 1975 Annual Report of Component Re-liability for Pneumatic Time Delays indicates a failure rate of 1 in 67 years.
The five percent repeat accuracy and extremely low failure rate indicate that these relays will operate satisfactorily throughout plant life.
David P Hoffman Assistant Nuclear Licensing Administrator
REC[IVED DOCUMPIT PIWCE.SSING UNif.
1977 JUL 18 PM 12 28
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