ML20128P777

Ro:On 850711,primary Coolant Unidentified Leak Rate Exceeded Tech Spec 3.4.5.2 Limit.Unit Placed in Hot standby.One-time Tech Spec Extension Granted to Allow Addl 72 H to Reach Cold Shutdown.Offsite Monitoring Unnecessary

ML20128P777
Person / Time
Site:	Palo Verde
Issue date:	07/15/1985
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
ANPP-33031-EEVB, NUDOCS 8507260507
Download: ML20128P777 (2)

Text

.

e Arizona Nuclear Power Project P.O. BOX 52034 e PHOENIX. ARIZONA 85072-2034 U. S. Nuclear Regulatory Commission ANPP-33031-EEVB/GEC Document Control Desk July 15, 1985 Washington, D. C. 20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS) Unit 1 Docket No. STN 50-528, License No. NPF-41 Report of Notification of Unusual Event --

Plant Condition Outside LCOs Requiring Plant Shutdown File: 85-056-026, G.1.01.10 Gentlemen:

Attached please find a report describing a Notification of Unusual Event at the Palo Verde Nuclear Generating Station (PVNGS). This report addresses a required plant shutdown arising from plant conditions outside the Technical Specification Limiting Condition For Operation related to Reactor Coolant System Unidentified Leakage.

This report is prepared and submitted pursuant to Table 5.1-1 of the PVNGS Emergency _ Plan. By copy of this letter we are also forwarding a copy of the report to the Regional Administrator of the Region V Office and other offsite authorities.

If you have any questions or concerns, please contact me.

Very truly yours, W l E. E. Van Brunt, Jr.

Executive Vice President Project Director EEVBJr/GEC/s1h Attachment cc: J. B. Martin R. P. Zimmerman R. F. Fish, Jr.

E. A. Licitra R. A. Colson, ADES C. E. Tedford, ARRA R. E. Bluhm, ACDCD&ES R. G. Godbehere, MCSO R. T. Milstead, DPS INP0 Records Center v%

h 8507260507 850715 PDR S

ADOCK 05000528 PDR 1 fh

w.

PALO VERDE NUCLEAR GENERATING STATION UNIT 1 NOTIFICATION OF UNUSUAL EVENT ON JULY 11. 1985

-Docket No. STN 50-528 License No. NPF-41 At approximately 0800 MST on July ll, 1985, the NRC Operations Center was notified,:via the Emergency Notification System, of.  ;

the declaration of a. NOTIFICATION OF UNUSUAL EVENT for Unit 1 of the Palo Verde Nuclear Generating Station (PVNGS). The

. NOTIFICATION OF UNUSUAL EVENT was required by the Emergency Plan Implementing' Procedure'(EPIP) '02 that= requires reporting of

" Tech. Spec. LCO Action Statement ~. requires Rx Shutdown,'or .

prevents' return to operation pending Engineering Evaluation."

A primary coolant unidentified leak rate of approximately 1.2 1

. gpm was noticed at about 0400 MST on July 11, 1985. This exceeded L'

the Technical Specification 3.4.5.2 value of 1.0 gpm. Four hours later, the leakage had still not been identified placing the unit:into an ACTION Statement that required being-in HOT STANDBY within six hours. A NOTIFICATION OF UNUSUAL EVENT was declared

- at-that time.

A special, one-time Technical Specification extension was requested and. granted to Tech. Spec. 3.4.5.2 which allowed an additional 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to. reach COLD SHUTDOWN. All. ACTION State-ments.were complied with and no releases of radioactive material

. requiring offsite response or monitoring occurred.

. An ongoing reevaluation of; leakage rate allowed the NOTIFICATION 0F UNUSUAL EVENT to be terminated at 2105 on July 11', 1985.

6

_ _ _ _ _ _ . _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ . _