ML19261F350
| ML19261F350 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 10/15/1976 |
| From: | Arnold R METROPOLITAN EDISON CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| GQL-7470, NUDOCS 7910250810 | |
| Download: ML19261F350 (1) | |
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POST OFFICE BOX 542 READING, PENNSYLVANIA 19603 TELEPHONE 215 - 929 ':601 October 15, 1976 GQL lh70 Mr. J. P. O'Reilly, Director Office of Inspection and Enforcement, Region 1 U. S. Nuclear Regulatory Cc==ission 631 Park Avenue King of Prussia, Pennsylvania 19h06
Dear Sir:
Docket No. 50-289 Operating License :Io. DPR-50 Three Mile Island IIuclear Statien, Unit 1 (TMI-1)
IE Circular 76-02 Attached please find our respense to IE Circular 76-02 submitted by your office on August 18, 1976. We trust this report addresses all your inquiries on the subject.
Sinc erely, R. C. Arnold Vice President RCA:JMC:tas Attach =ent y
1482 091 1910250 '/O 7
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Response to IE Circular 76-02
Reference:
GQL 0660, dated May 7,1976 (Response to IE Bulletin 76-05)
As noted in the referenced respense, ve do have 3FD relays in safety releted systems.
BFD relays are used on Westinghouse DHP circuit breakers use in the hK7 ES buses and also in the controls fer the emergency diesel generators. As previously indicated we plan to replace the EFD relays on the diesel generator becausc of the coil temperature problem. We have obtained and evaluated two relays of a new type that we believe vculd resolve the coil temperature problem.
The new tg pe relay, hcVever, may be subject to the armature pin problem. We have been infcrmed by Westinghcuse that they have recently developed a relay that vill not be subject to the pin problem or coil temperature problem.
Based en the availability of the recently developed relays we plan to replace the EFD relays in the diesel gererater centrols during the next refueling cut-age.
At this time ve do not plan to replace the relays on the hK7 circuit bre akers.
The following actions are planned or have been ce=pleted regarding EFD relays in safety related systems:
1.
Subsequent to the previous notice, a functienal test was performed on the EFD relays associated with the A diesel generator.
All the relays tested operated correctly.
2.
There are 2 BFD relays used as emergency start relays for the diesel generators. On an Engineered Safeguards actuation signal both relays energize causing the diesel to start. Energi:ing either relay will result in the diesel starting.
The periodic test procedure verifies each relay separately. No special testing is required for the other BFD relays in the diesel controls.
3.
The effect of failure to energize the "Y" relay on the hKV breakers has been evaluated. The "Y" relay is incorporated in the anti pu=p feature of the breaker.
Failure of the "Y" relay to energi e vill not prevent the breaker from closing therefore, no special testing is required.
In sunmary; we intend, during the next refueling cutage (March,1977), to replace the EFD relays on both diesel generaters to eliminate the coil temperature and armature pin problem. We do not plan any testing of the relays other than the Technical Specification Surveillance Tests en the affected components.
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