ML18046A247

Forwards Comments on Util Concerns Expressed in . Revision 2 of Loss of Offsite Power - Survey Status Rept Adequately Addresses Comments Raised for Facility

ML18046A247
Person / Time
Site:	Palisades
Issue date:	12/04/1980
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
LSO5-80-12-003, LSO5-80-12-3, NUDOCS 8012240496
Download: ML18046A247 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 OEr. 0 4 1980 Docket No. 50-255 LSOS-80-12-003

.~*

G>'

CJ t'::i; f':!<"~

b=:J

~lh:

.:,".HJ i@i:;;::J*

t§S'.':~

L1(1~

"'.:'1-w

--tn

{,.!

',.)

• ...,J Mr. David P. Hoffman Nuclear Licensing Administrator Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201

Dear Mr. Hoffman:

RE:

COMMENTS ON OFFSITE POWER SUPPLY - PALISADES PLANT The staff has reviewed the corrments contained in your letter of October 28, 1980.

Our detailed responses to your concerns are enclosed.

We believe that Revision 2 of the Loss of Offsite Power - Survey Status Report adequately addresses the corrments raised by your letter concerning the Palisades Plant.

We again request that you submit the data for Big Rock Point.

Enclosure:

Responses to Consumer's Comments cc w/enclosure:

See next page

• 0-Q

(/)*

l'.W g\\

~

~

t.:::

(,.) ~:r:

(J~"'

(..)

~~~

.* ~

~

~"1 o.. :

I-c

{_;-J L;

g? '

lil-**

Sincerely,

~'?!!tthW~

Operating Reactors Branch #5 Division of Licensing

Mr. David P. Hoffman cc M. I. Miller. Esquire Isham. Lincoln & Beale Suite 4200 One First National Plaza

_CMcago. Illinois 60670 Mr. Paul A. Perry. Secretary Consumers Power Cont>ar\\Y 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Cont>ar\\Y 212 West Michigan Avenue Jackson. Michigan 49201 Myron M. Cherry. Esquire Suite 4501 One IBM Plaza Chicago~ Illinois 60611.

. Ms. Mary P. Si nc 1 a i r Grea.t Lakes Energy Alliance 5711 Sununerset Ori ve Midland, Michigan 48640 Kalamazoo Public library 315 South Rose Street Kalamazoo. Michigan 49006 Township Supervisor Covert Tawnship Route 1. Box 10 Van Buren County. Michigan 49043 Office of the Governor (2)

Room 1 ~ Capitol Building Lansing. Michigan 48913 Director. Technical Assessment Division Office of Radiation Programs (AW-459)

U. s. Environmental Protection Agency Crystal Mall #2 Arlington. Virginia 20460.

PALISADES DOCKET ~O. 50-255

u. s. Environmental Protection Agency Federal Activities Branch Region V Office ATTN:

EIS COORDINATOR 230 South Dearborn Street Chicago. Illinois *60604 Charles Bechhoefer. Esq., Chainnan Atomic Safety and Licensing Board Panel V* s. Nuclear Regulatory Conmission Washington. o. c. 20555 Dr. George c. Anderson Department of Oceanography University of Washington Seattle. Washington 98195 Dr. M. Stanley Livingston 1005 Calle Largo Santa Fe, New He xi co 87501 Resident Inspector c/o U. S. NRC P. o. Box 87 South Haven, Michigan 49090.

Palisades Plant ATTN:

Mr. J. G. lewis Plant Manager Covert, Michigan 49043 William J. Scanlon. Esquire 2034 Pauline Boulevard Ann Arbor. Michigan 48103

'"\\.......,

RESPONSES TO CONSUMERS'S C0""1ENTS

1.

Page 2 First Paragraph

a. Bas1ng fault data on a per circuit mile per year statistiC would probably provide additional insights into the causes of some failures. However, the primary purpose of the survey.was to detennine the rate of occurrence not cause.

fl.

The list of causes was developed during our review of survey responses.

c. A minimum time threshold was considered, however, a basis for the minimum time co~ld not be established.

d.

Cause 4 was not intended to reflect human error, rather it was to accumulate data on a specific type of relay failure.

The staff's objective was to obtain fatlure rate data.

2, Page 2 Second Paragraph

a.

The twelve events caused by loss of ca.rrier were moved to Event 7 in Revision

2.

b.

Eighteen (not nineteen) events on six transmission circuits is equivalent to six events on two transmission circuits.

• 3.

Page 2 Paragraph 3 a,

The three cause-0 and tt:ie one cause-5 events that cannot be found in the data file for parti"al loss of offsite power (LOP-A) are located in the data file for total losses of offsite power (LOP-B).

b, The error regarding cause 15 was.corrected in Revision 2.

c, *The transfer of data from Table 4 to the rate.tables was not done by computer.

Ttlts is a *manual, clerical function.

d, With regard to the events on 1/11/74 and 6/14/77 and your statement that the caus*e of tf\\e losses are unknown, please explain why the Y-phase to

. ground fault relay trtp (1/11/74) and X-phase to.ground fault relay trip (6/14/77). should be listed as "unknowns."

4, page 3 Top - See Comment 2.b 5,

• Pa9e 4 Second Paragraph a,

Revtsion 2 of the report is nonna l i zed to the number of power 1 i nes.

b.

The number of times* targets are exceeded was reduced by normalizing the data to the number of transmission lines.

• 6.

Page 4 Third Paragraph

a. It is suggested that you review the Draft Regulatory Guide on Lightning Protection that has been issued for public comment and NFPA 78-1979 for methods of minimizing the effects of lightning.

SEP Topic VII-3, which will be forwarded shortly to you, identifies additional methods which you might use to improve switchyard perfonnance.

b.

Previous efforts to obtain time trends on Palisades data did not result in an acceptable (95%) confidence level in the fits.

c.

We agree that construction related outages are relatively insignificant (See Conclusion 2 of Revision 2).

7.

The staff believes that other conments in the October 28, 1980 letter that are not addressed in the preceeding six corrments are adequately resolved by Revision

2.

.