ML17298B657

Confirms Items Discussed at 841116 Meeting Re Fire Protection Audit Conducted at Facility

ML17298B657
Person / Time
Site:	Palo Verde
Issue date:	12/04/1984
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
ANPP-31310-WFQ, NUDOCS 8412170095
Download: ML17298B657 (8)

Text

Arizona PubHc Service Company RECB't/Eg t<~i+10 jap( O-~

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Mr. John B. Martin, Administrator U.S. Nuclear Regulatory Commission Region V

1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368 December 4,

1984 "Eah')I p~<-

ANPP-31310 WFg/DKN

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2 and 3

Docket Nos. STN-50-528/529/530 Fire Protection Review File: 84-056-026;. G.1.01.10

~~Op)'ear Mr. Martin:

This will confirm several items discussed at the November 16, 1984 exit meeting for the Region V Fire Protection Audit conducted at PVNGS:

QUESTION 1:

RESPONSE

QUESTION 2:

RESPONSE

Will automatic fire sprinkler system discharge in the main steam support structure adversely affect redundant electrical equipment needed for safe shutdown?

The el ectri cal equi pment is NEMA 3, waterti ght and wi 1 1 not be adversely affected by water spray from the sprinkler system.

Would there be potential for steam pipe rupture from the sprinkler system discharging into steam pipes?

It was noted during further review with the NRC that the steam pipes are insulated with refractory material with an aluminum outer skin.

These features combine to prevent any direct impingement of water onto steam pipes.

It was agreed at the exit meeting that the thermal insulation is adequate to prevent direct contact from sprinkler system discharge.

QUESTION 3:

Can the sight glass on the Reactor Coolant Pump lube oil collection system tanks withstand hot oil without breaking?

RESPONSE

The sight glass is high temperature Pyrex.

In addition, the tubular sight glass assembly valves have corrosion resistant steel ball checks for instant shutoff should the glass break for any reason.

These features wi 11 prevent accidenta.'1 leakage of oil from the si ght glass assembly 841P1~009>-=--

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Fire Protection Review ANPP-31310 Page 2

QUESTION 4:

RESPONSE

lushy is a flexible electrical connector to the main feedwater isolation valves wrapped with fireproofing material but the junction box is not wrapped?

The fireproofing was originally intended for protection in accordance with 10CFR50 Appendix R.

However, upon further analysis, it was determined that the valves fail in the safe (closed) position, therefore the fireproofing is not required.

QUESTION 5:

RESPONSE

QUESTION 6:

RESPONSE

The NRC noted the existence of non-fire rated missle doors protecting the openings between the Control Building cable spreading rooms (120'"

and 160'" elevation),

and the Corridor Building in a 3-hour rated fire wall.

The existence of these doors was listed in response to the NRC open audit item No.

1 (FSAR Question 9A.106).

However, a deviation to 10CFR50 Appendix R was not requested because the doors communicate to the non-safety related Corridor Building.

They do not separate redundant safe shutdown equipment.

The doors are solid steel approximately three inches thick and are normally kept closed during plant-oper ation.

Detection and cable tray water, suppression systems are installed in the cable spreading rooms.

Therefore, adequate fire barrier protection is provided by these doors.

A concern was expressed about the lack of a return air ventilation duct installed in the flammable gas storage closet for the laboratory on the 140'" level of the auxiliary building.

Specifically, it was noted that only supply ventilation is provided.

An engineering evaluation will be performed to address thi s concern.

Any resulting modification to the return air ventilation system will be implemented by the first refueling outage.

The current design has no affect on the Unit 1 safe shutdown capability.

In the interim, we'believe the present ventilation system provides reasonable

'assurance that should any flammable gas leakage occur, it will not 'accumulate in the room, and will be quickly dispersed into-the return air ventilation system serving the Corridor just outside the closet.

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Mr. J.B. Mart Fire Protection Review ANPP-31310 Page 3

Please contact Mr. W.F. Quinn of my staff if you have any questions on this matter.

Very truly yours, EEVBJr/DKN/no APS Vice President Nuclear Production ANPP Project Director cc:

E.A. Licitra D.J. Kubicki A.C. Gehr R.P.

Zimmerman P.

Quails

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December 4,

1984 ANPP-31310 STATE OP ARIZONA

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COUNTY OP MRICOPA)

I, Donald B. Karner, represent that I am Assistant Vice President, Nuclear Production of Arizona Public Service

Company, that the foregoing document has been signed by me on behalf of Arizona Public Service Company with full authority to do so, that I have read such document and know its

contents, and that to the best of my knowledge and belief, the statements made therein are true.

Donald B. Karner Sworn to before me this < kf day o

H 1984.

Notary Public

, My Commission Expires:

",;Qycgomm<ss10n Expires April 6, 188?

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