ML17321A581

Discusses Rev to Tech Spec Re Diesel Generator Surveillance Testing,Per Discussions on Generic Ltr 84-15.Actions to Reduce Cold Fast Start Tests,Eliminate Requirements Leading to Degradation & Establish Reliability Goals Described

ML17321A581
Person / Time
Site:	Cook
Issue date:	04/24/1985
From:	Alexich M, Alexich W INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	Harold Denton Office of Nuclear Reactor Regulation
References
AEP:NRC:0896A, AEP:NRC:896A, GL-84-15, NUDOCS 8504290378
Download: ML17321A581 (8)

Text

f REGULATO -INFORMATION DISTRIBUTION TEM (RIDS)

ACCESSION NBR;8500290378 DOC ~ DATE: 85/00/2g NOTARIZED;. NO DOCKET~ P FACIL:50-315 Donald C~ Cook Nucl ear Power Pl ant'g Unit 1g Indiana 8

~ 05000315:

BYNAME 50-316 Donald C'. Cook- Nuclear Power Planti Unit- 2'< Indiana L AUTH AUTHOR AFFILIATION ALEXICH<W,P, Indiana- L Michigan Electric Co.

RECIP ~ NAME RECIPIENT AFF II IATION 05000316'UBJECT:

DENTONgH ~ RE Office. of Nuclear Reactor Regulationp Director~

Discusses rev to Tech Spec re diesel generator surveillance<

testing<per discussions on Generic"Ltr 80 15 ctions to reduce" cold fast start;;.;.<eliminate'requirementrs leading to degradiation L establish reliability described,;

DISTRIBUTION CODEt A056D COPIES RECEIVED:LTR ENCL> SIZE'i TITLE: OR Submittal:Fast Cold Star ts of Diesel Generators GL~83 Oi (GL 84 15 NOTES'L:

10/25/7Q OL: 12/23/72" 0500031'5'5000316'ECIPIENT'D COPIES RECIPIENT COPtES CODE/NAME, LTTR ENCl> ID CODE/NAME LTTR NRR'RB1 BC 01 INTERNAL; ACRS'3 AEOD" 07 6

1 ADM/LFMB; IE/DEPER/EAB 08 NRR/DL/ORAB 09- NRR'/DSI/PSB 10 E'4 1

IB 2 NRR/DST'/SPEB 11 ENCL'XTERNAL; REG F 1 RES'ARANOWSKI'GN3 0/RRB 12'. 06 LPDR 03 NRC PDR 02" 1 1 NSIC 054 0

TOTAL NUMBER OF COPIES REQUIRED: LTTR 25 ENCL

~.g M

I 'I 'I M

I M

h 1 M g,t N M I 'I I ~ a e f

'4 4 P 4 Mh I, 4

,C M ti II 4 It t

M M

INDIANA 8 NICHIGAN ELECTRIC CONPANY P.O. BOX 16631 COLUMBUS, OHIO 43216 Apri1 24, 1985 AEP:NRC:0896A Donald C. Cook Nuclear Plant Unit Nos. 1 and 2 Docket Nos. 50-315 and 50-316 License Nos. DPR-58 and DPR-74 GENERIC LETTER 84-15, PROPOSED STAFF ACTIONS TO IMPROVE AND MAINTAIN DIESEL GENERATOR RELIABILITY Mr. Harold R. Denton, Director Off1ce of Nuclear Reactor Regulat1on U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Denton:

Pursuant to discussions with your staff, and as a follow-up to the suggestions made regarding Generic Letter 84-15, we would like to offer some ideas on the revision of the Technical Specifications associated with diesel generator surveillance testing.

In Generic Letter 84-15, Mr. Eisenhut made three recommendations in order to improve diesel generator reliability:

o The number of oold fast starts should be reduced.

o Requirements that would lead to degradation should be eliminated.

o Reliability goals should be established.

Towards this same goal of improving diesel generator reliability, we feel that the following comments reflect some of the 1tems which are acceptable with regard to that Generic Letter.

o The diesel generator starting frequency should be as follows:

Start a diesel on the affected Unit(s) within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the loss of one offsite source or one diesel, unless the lost diesel or offsite source is restored within that time.

Start a diesel on the affected Unit(s) with1n 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> after ('1) the loss of one diesel and one offsite source or (2) both offsite sources, unless the lost diesel and/or offsite source(s) are restored within that time.

Loss of both diesels requires shutdown of the affected Unit within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

8504290378 850424',

PDR ADOCN 050003i 5,'DR

'I I

~ ~

Mr. Harold R. Denton AEP: NRC: 0896A Start each diesel (using manufacturer's recommended low acceleration rates and pre-warm1ng and pre>>start1ng condit1oning) once per 31 days on a staggered basis for one or zero failures in last 20 starts, or once per 15 days for 2 or more fa1lures in last 20 starts.

o Diesel repair time shall not exceed one week for a single outage, or a total of one month accumulated annual outage for a single diesel exclusive of that outage time related to MODES 5 and 6. If a diesel exceeds this maximum annual outage, it is fair that it be requalified. This requalification program should include both an analysis of the root causes of failure and a schedule of aot1ons to be taken to correct the root causes.

o Fast starts are to be required only once per 6 months.

o If the diesel must be requalif1ed, the requalification sohedule should inolude a requirement of 21 starts with no failures or 28 starts with one failure.

The Technical Specifications that result from these revisions will provide the follow1ng benefits:

o They will allow for an extended interval before engine starting after offsite power outages and/or short outages of the opposite diesel, resulting in fewer eng1ne starts.

o They will permit lower acceleration rates for the ma)ority of surveillance starts, thus decreasing equipment deterioration.

o They will include reasonable prov1sions for a requalification program.

In summary, there will be fewer surveillance starts, adequate maintenance time (which will encourage correotion of the root causes of failures), and less-destructive starting conditions for most starts. The overall result should be not only extended engine life, but also the consequent improvement in starting reliability.

These comments are being transmitted, 1n lieu of subm1tting specif1c Technical Specifications, 1n response to Generic Letter 84-15.=- A Technical Specification Change Request on the diesel generators incorporating many of these comments will be transmitted at a later date as part of our Technioal Specification Clarification program.

There 1s one further item which we would like to bring to your attention in this matter. As d1scussed with your staff, since we do not do cold fast starts on the Cook Plant diesels (see AEP:NRC:0896), we understand that we are not required to submit cold fast start Technical Specifications.

$ Je would be glad to discuss any of the issues brought up in th1s letter (i.e., the Technical Speoification olarificat1on program or the technical merits of the ideas submitted above) at your convenience.

.I j.tk M

h ~, h h th,) II

~, 'k

)

M 'Mhk P ~ 8 h Ik

~ '

l ~

I

/MII I

'\ I k

0 Mk"J h

M h

JI M MP M

k M

~ .

Mr. Harold R. Denton AEP:NRC:0896A This document has been prepared following Corporate procedures which incorporate a reasonable set of controls to insure its aocuracy and oompleteness prior to signature by the undersigned.

Very truly yours,

/

M. P. A ex'.ch l~ ~'9 Vine President q)'P th cc: John E. Dolan W. G. Smith, Jr. - Bridgman R. C. Callen G. Bruchmann G. Charnoff NRC Resident Inspector - Bridgman

e P ,I, If P O>>)'Q "6 off ', P> l'*o) O

"" ~

) o p o>I >w d ~ 1\( I o p3 ) > ~

~ v

~ '>