ML17303A388

Requests Results of Updated Safety Analysis Using Actual RCP Coastdown Rate for Staff Review No Later than 870430.During Unexpected Turbine Trip at Facility on 860109,unsuccessful Fast Bus Transfer Resulted in Loss of Power to RCP

ML17303A388
Person / Time
Site:	Palo Verde
Issue date:	04/07/1987
From:	Licitra E Office of Nuclear Reactor Regulation
To:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
References
NUDOCS 8704090103
Download: ML17303A388 (4)

Text

(VSISe April 7, 1987 Docket Nos.:

50-528/529

~

~

Nr. E.

E.

Van Brunt, Jr.

Executive Vice President Arizona Nuclear Power Project Post Office Box 52034 Phoenix, Arizona 85072-2034

SUBJECT:

RCP COASTDOWN SAFETY ANALYSIS DISTRIBUTION

~N PR/L R

PD¹7 Reading/N.

Thompson F. Miraglia/E. Licitra OCG-Bethesda/J.

Lee E. Jordan/G.

Knighton B. Grimes/ACRS (10)

J. Partlow

References:

l.

ANPP Letter 39506, dated December 26, 1986.

2.

ANPP Letter 37623, dated July 29, 1986.

Reference (1) provides ANPP response to operational concerns raised during a

meeting between ANPP and NRC personnel on October 28, 1986.

Item 3 of Reference (1) and Reference (2) concerned the following:

During the unexpected turbine trip at PVNGS Unit 1 on January 9, 1986, an unsuccessful fast bus transfer resulted in a loss of power to the RCP's and the reactor tripped on flow projected low DNBR. It was noted that the RCPs coasted down at a rate that was faster than t'e rate assumed in the FSAR.

Following this discovery, penalty factors were applied to the CPCs and the Core Operating Limit Supervisory System (COLSS) in PVNGS Units 1 and 2 to account for this non-conservatism.

Reference (1) states that a subsequent analysis by the NSSS vendor justified the removal of these penalty factors.

This is because the earlier reactor trip compensates for the faster coastdown rate.

We ask that you provide the results of the updated safety analysis using the actual RCP coastdown rate for staff review.

Also Section 15 of PVNGS FSAR should be updated with the updated analysis.

Please provide the requested information as early as possible, but not later than April 30, 1987.

If you have any questions regarding this request, please contact me on (301) 492-8599.

Sincerely, Original signed by t1ichael Davis for E. A. Licitra, Project Nanager PWR Project Directorate No.

7 Division of PWR Licensing-B cc:

See next page

• See previous concurrence PD¹7 PD¹7 ELicitra:cd GKnighton 4/7/87 4/7/87 OFFICIAL RECORD COPY 87040'POl03 870407 PDR ADOCK 05000528 P

PDR

<<Tt I

~

I l )

t l

H I t' flit

~ "~ (I) )

I*

~ rt.ll I Wrr V I

~

lr h

• 'r

~'l p r, I]

I f

I If

~

~ l

<<VI, r",

)W w'f r

'Ij") ")hl

~ ]

I

) <<H jl << I r-)l, W

t

'I

~

~ '.

l(, )ll h

v(

I l 'jt(, HV. I

)ww(

I ~

'I Il H

I I'.

ll p

I' Ul j H

", <<IW<<

I (

m I,

"r l Y

r

)

jll) I

~

<<W I)

IJI

. <'(.) ~

I fg IY I

)

~

I YH"

'I I

HJ r,f

'I

~ t I p

~

r.f I f l

r'>tr"

) IIrt<<(rl

'Jt) r) r r

= ~

r("

) ll V )

H r

W

~

r ) Iwlj,. Wl'l

~ 'I.

~

I

"~

<<)r,'fl I

~ l

tr..

E.

E.

Van Brunt, Jr.

Arizona Nuclear Power Project Palo Verde CC:

Arthur C. Gehr, Esq.

Snell 5 Wilmer 3100 Valley Center Phoeni x, Arizona 85073 Hr. James M. Flenner, Chief Counsel Arizona Corporation Commission 1200 West Washington Phoenix, Arizona 85007 Charles R. Kocher, Esq. Assistant Council James A. Boeletto, Esq.

Southern California Edison Company P. 0.

Box 800

Rosemead, California 91770 Hr. Hark Ginsberg Energy Director Office of Economic Planning and Development 1700 West Washington - 5th Floor Phoenix, Arizona 85007 Kenneth Berl in, Esq.

Winston 8 Strawn Suite 500 2550 H Street, NW Washington, DC 20037 Hs.

Lynne Bernabei Government Accountability Project of the Institute for Policy Studies 1901 gue Street, NW Washington, DC 20009 Mr.

Ron Rayner P. 0.

Box 1509

Goodyear, AZ 85338 Mr. Charles B. Brinkman, Manager Washington Nuclear Operations Combustion Engineering, Inc.

7910 Woodmont Avenue Suite 1310

Bethesda, Maryland 20814 Mr. Wayne Shirley Assistant Attorney General Bataan Memorial Building Santa Fe, New Mexico 87503 Hr. Roy Zimmerman U.S. Nuclear Regulatory Commission P. 0.

Box 239 Arlington, Arizona 85322 Ms. Patricia Lee Hourihan 6413 S.

26th Street Phoenix, Arizona 85040 Regional Administrator, Region V

U. S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596

l~