ML17297A919

Forwards Clarificaion of 810928 Response to Containment Sys Branch Questions Re Containment Spray Sys

ML17297A919
Person / Time
Site:	Palo Verde
Issue date:	09/30/1981
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Tedesco R Office of Nuclear Reactor Regulation
References
ANPP-19049-JMA, NUDOCS 8110130386
Download: ML17297A919 (14)

Text

REGULAtTORY INFORMATION DISTRISUT ON SYSTEM (RIDS)

ACCESSIOV! NBR:811 FACILi:STN 50 528 STN-50-529 STN 50 530 AUTrll,NAME.

V A N 9 R U lViTI Kr~ E "~

REC IP ~ VAMEI TEDESCOgR,Li, 0130386" DOC ~ DATKi: 81/09/30 NOTARI2ED:

YES Palo Verde Nuclear Stati one Un-it ir Ar izona Publi Palo Verde Nuclear Stations Unit 2r Arizona Publi Palo Ve'rde Nuclear Stations Unit 3r Arizona Publi AUTHOR AFFILIATION Arizona Public Sar vicer Co.

RECK PZENT AF F ILiIATI ON Assistant Directori for Licensing DOCKEITI ¹ 05090530 SUBJECT!: Forfar ds clarificaion of 810928 r esponse to Containment Sys Branch questions re containment spray sys

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IKIIZDIICIEHKCIOa tMHIP%RF P.O. BOX 21666 PHOENIX, ARIZONA85036 September 30, 1981 ANPP-19049-JMA/WFQ Mr. R. L. Tedesco

'ssistant Director for Licensing Division of Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.

20555 op~ 8/pf.

Subject:

Palo Verde Nuclear Generating Station (PVNGS) Units 1, 2 and 3

Docket Nos. STN-50-528/529/530 File:

81-056-026 G.l;10

Reference:

Letter from E. E. Van Brunt, Jr.,

APS, to R. L. Tedesco, dated September 28, 1981 (ANPP-19014)

Subject:

CSB Questions.

Dear Mr. Tedesco:

Attached is a clarification of our response provided by the referenced letter as discussed with Energy Incorporated (telecon),

September 30, 1981.

If you have any questions, please contact me.

Very truly yours, W F.V~'8n,.~

E. E. Van Brunt, Jr.

APS Vice President, Nuclear Projects ANPP Project Director EEVBJr/MPQ/ma Attachments/

cc:

J. Kerrigan (w/a)

P. Hourihan (w/a)

A. Gehr (w/a)

J.

Huang, NRC (w/a)

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STATE OF ARIZONA

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COUNTY OF MARICOPA)

I, Edwin E. Van Brunt, Jr., represent that I am Vice President Nuclear Projects of Arizona Public Service Company, that the foregoing document has been signed by me on behalf of Arizona Public Service Company with full authority so to do, 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.

Sworn to before me this day of My Commission expires:

Edwin E. Van Brurb;",J'r,.

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Item 2

The staff requested inclusion of a caution statement in procedures to terminate containment spray.

The caution was to inform operators that forced hydrogen mixing depended on operation of the containment spray system.

~Res onse 5~7 See attached Revised PVNGS FSAR page 6.2~

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PVNGS FSAR CONTAINMENT SYSTEMS Table 6.2.S-l COMBUSTIBLE GAS CONTROI SYSTEM DESIGN PARAMETERS (Sheet 3 of 3)

Parameter Value Heating coil capacity, kW HEPA filter (downstream)

Quantity and size Pressure drop, clean, in.

WG Efficiency 0.25 1

24x24x12 O.SO 99.9% minimum of particulate matter of 0.3 micron or larger size Following a LOCA, the containment spray system is automatically i"1 t ~

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buildup within the containment as well as remove fission products from the containment atmosphere and reduce containment, pressure.

Within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after a LOCA both redundant hydrogen analyzers are manually activated to monitor hydrogen levels and to alert the operator in the control room when operation of the hydrogen" recombiners or hydrogen purge system is required; i.e.,

at or below a hydrogen concentration of 4 vol %.

The recombiners are manually started before hydrogen concentra-tion reaches 3.S vol %.

Figure 6.2.5-2 shows tnat this occurs at approximately 10.7 days after the LOCA.

In the unlikely event, that both recombiners fail; the hydrogen purge subsystem will be manually put into operatio when hydrogen concentration reaches 3.5 vol %.

6.2.5.2.2 Hydrogen Mixing Hydrogen mixing within the containment is accomplished by the containment spray system and the containment internal structure

design, which permits convective mixing and prevents entrapment (Design Basis B).

procedures concerning, termination of system operation contain statements to caution'perators regarding assurance that adequate 1fydrogen mixing has been accomplished and further forced circulation is not requiredSZ

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I'tern 3 The staff indicated that the containment refueling purge isolation valves should be sealed closed except during operational modes 5 and 6.

~Res ense See attached revised PVNGS LLXR Page XX.E.4.2-6.

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PVNGS LLIR 0

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Containment power access purge isolation valves satisfy the operability criteria setforth in Branch Technical Position CSP 6-4.

Containment refueling purge isolation valves will be sealed closed except during operat;ional modes 5 and 6.

(Co3.d shutdown and refueling respectiv ly, see CESSAR Section 16.1.1).

7.

As stated in item 1 above, both the power access purge and the refueling purge isolate on high con-tainment purge radioactivity.

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Amendment 2

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