ML20085F582

Updated AOs AO-21-74,AO-6-75 & AO-7-75,in Response to 750512 Request for Addl Info.Cause of Failure of Diesel Generator 1-1 Air Start Motor Not Determined

ML20085F582
Person / Time
Site:	Palisades
Issue date:	06/18/1975
From:	Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20085F584	List: ML20085F582 ML20085F859 ML20085F867
References
AO-21-74, AO-6-75, AO-7-75, NUDOCS 8308230019
Download: ML20085F582 (2)

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Mr. James G. Keppler Re: Docket 50-255 Office of Enforcement & Inspection License DPR-20 Region III Palisades Plant US Nuclear Regulatory Commission Additional Information Glen Ellyn, IL 60137 A0-21-Th, 6-75 & 7-75

Dear Mr. Keppler:

By letter dated May 12, 1975, you requested additional infor-mation on Abnormal Occurrences 21-74, 6-75 and 7-75. This letter provides the requested information.

Requent 1.a

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A0-P1-Th - Failure of Diesel Generator 1-1 Air Start Motor FSAR Section 8.h.l.2 indicates that "Each engine has two inde-pendent starting control circuits including two air motors, ... " Describe the cause of the slov start on the single air motor and the corrective actions.

Response .

A review of our records shows that the cause of the slov start-ing time was not deteruined. We have, however, reviewed the starting times since this A0 and conclude that the slow start was an isolated occurrence since it has not reoccurred.

Request 1.b A0-21 Failure of Diesel Generator 1-1 Air Start Motor The justification for modifying the test procedure to test the diesel starting using both air motors is not clear particularly since this test method identified a relay failure which would not apparently

• have been otherwise identified. Provide your justification for modifying the test procedure.

Response COPY SENT REGION m

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The monthly testing procedure for the emergency diesel generator requires testing the starting times using only one of the air motors g '

B308230019 750618 PDR ADOCK 05000255 d) 4 S PDR N p#' ,l

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- fir. James G. Keppler 2 Docket 50-255, License DPR-20 June 18,1975 i

(each air motor is tested every other month) and thus the type of failure which caused A0-21-716 would be identified. Ac mentioned in A0-21-714, however, we would not consider failure to start, using only one air motor, as an abnormal occurrence provided an immediate retest using both air motora started the dienel generator catisfactorily.

Itequent 1.c A0-Pl Failure of Dienel Generator 1-1 Air Start Motor Diccuss the applicability of the failure and corrective action to the other diesel generator.

Recponse Dtch of our diesel generators has twenty-ceven of the multi-contact relays identical to the one that failed. Since ve have had no similar problems with these relaya, ve concluded that thic failure was an icolated occurrence.

Request 2 A0-6 '(5 and 7 High Effluent Heat Rate and Tenperature i

The cause van atttted "to be accociated with plant procedure problems." Corrective action does not indicate procedures vill be re-vined. Provide details with respect to corrective action to prevent a recurrence.

Heaponne The plant procedures for " Circulating Water and Chlorination Gyntemn" have been modified following the subject AO. These modifica-tions, however, are considered an interim colution. As you are aware, we have had very limited experience with the closed cycle cooling system which has recently been installed at the Id ant and have not removed the cooling towera from cervlee cince ther-e occurrences.

An mentioned in the reporting of these abnormal occurrences, we have initiated a ntudy of the closed cycle cooling cyctem. We vill not, however, be able to conclude the study until we have experienced a inunber of cooling + over start-upa and chutdowns.

Youra very truly, Ralph B. Sewell (Signed) 1)AB/dn Ralph B. Sewell CC: Directorate of Licensing

O NUCLEAR REGULATORY COMMISSION O

REClGN lli 799 ROOSEVELT RO AD GLEN ELLYN. ILLINOIS 60137 May 12, 1975 Consu:ners Power Company Docket No. 50-255 ATIJ tir. R. L.11auter Electrical Production Supt., Nuclear 212 West Michigan Avenue Jackson, Michigan 49201 Centlement To complete our review of abnortaal occurrence 21-74 6-75 and 7-75 we require additional information. Please provi additional informa-tion requested in the unclosure to this letter within 30 days of receipt of this letter.

G. Flore111, Chief Reactor Operations Branch I:nclosure:

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O o ENCLOSURE 1

1. A0 21 Failure of Diesel Generator 1-1 Air Start Motor /

a. FSAR Section 8.4.1.2 indicates that "Each engine has two independent starting control circuits including two air motors, . . ." Describe the cause of the slow start on the single air motor and the cor-rective actions. .

b. The justification for modifying the test procedure to test the diesel starting using both air motors is not clear particularly since this test method identified a relay failure which would not apparently have been otherwise identified. Provide your justifica-tion for modifying the test procedure.

c. Discuss the applicability of the failure and corrective action to the other diesel generator.

2. A0 75-6 and 7 - High Effluent Heat Rate and Temperature !E!

The cause was stated "to be associated with plant procedure problems."

Corrective action does not indicate procedures will be revised. Provide details with respect to corrective action to prevent a recurrence.

1_/ CPC Sewell's letter to Directorate of Licensing dtd 10/18/74.

2/ CPC Sewell's letter to Directorate of Licensing dtd 4/14/75.

3/ CPC Sewell's letter to Directorate of Licensing dtd 4/16/75.

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