ML17279A666

Forwards Request for Addl Info Re Generic Ltr 87-05 Concerning Drywell Degradation.Info Needed Includes Drawings or Sketches Showing Drain Lines from Refueling Pool.Response Required within 60 Days of Receipt of Ltr

ML17279A666
Person / Time
Site:	Columbia
Issue date:	12/04/1987
From:	Knighton G Office of Nuclear Reactor Regulation
To:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
References
GL-87-05, GL-87-5, IEB-86-099, IEB-86-99, NUDOCS 8712090013
Download: ML17279A666 (17)

Text

phd R)G(j P

~

p 0O

~

4~ +**++

Docket No. 50-397 UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 December 4, 1987 PDR ADOCK 0600039y1 8712090013 871204 P

PDR LL Mr. G.

C. Sorensen, Manager Regulatory Programs Washington Public Power Supply System P.O.

Box 968 3000 George Washington Way Richland, Washington 99352

Subject:

GENERIC LETTER 87-05 AND WNP-2 On December 8, 1986 NRC issued to all nuclear power plants Information Notice No. 86-99 describing circumstances which led to the corrosion of the drywell shell of the Oyster Creek Nuclear Generating Station.

On March 12, 1987 the staff issued Generic Letter 87-05 to all 'licensees of boiling water reactors utilizing Mark I containments requesting information to determine whether similar degradation of the drywell has occurred at their facilities.

Even though Generic Letter 87-05 was not issued to WNP-2, design features which contribute to drywell shell corrosion at Mark I containments appear to exist at WNP-2. Therefore, we believe Generic Letter 87-05 is relevant and applicable to the free standing containment at WNP-2.

WNP-2 is the only Mark II plant design with a steel containment.

The steel containment is enclosed in a reinforced concrete biological shield structure with an air gap separating the containment and the shield above the foundation mat.

The air gap leads to the sand filled pocket at the knuckle region immediately above the concrete mat foundation.

The refueling pool design in Mark II appears similar to that in Mark I. Depending on the design of the reactor head cavity seal drain connections and the functionality of various drain lines, there is the potential for leakage of water through the air gap into the sand filled pocket creating a situation similar to the Oysters Creek experience.

Pt WNP-2 the corrosion may be more significant than with the Mark I drywell.

This is because the area of the containment shell where wastage of the steel may occur forms a portion of the boundary of the suppression pool and any indicated through-thickness corrosion may lead to the leakage of water from the suppression pool. In the event of a reactor accident this could result in much highe~ containment pressure and temperature than the containment is designed for.

~ '

1 i

~s~

3c)

Mr. G.

C. Sorensen, Manager 2

On the basis of these concerns we request that you provide the information identified in the enclosures to this letter.

Please respond within sixty days of receipt of this letter.

Sincerely, original signed by George W. Knighton, Director Project Directorate No.

5 Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc:

See next page DISTRIBUTION:.'7 RRC 8 Local PDRa PDV Reading DCrutchfield GHolahan JLee RSarworth OGC-Bethesda EJordan JPartlow ACRS (10)

WNP-2 Plant GBagchi WLong CPTan RSP/PDV D

RSamworth G

hton 12/ P /87 12/

/87 OFFICIAL RECORD COPY

,k

't

,I C

II I

l ll>%'I

'i

Mr. G.

C. Snrensen, Manager On the basis of these concerns we request that you provide the information identified in the enclosures to this letter.

Please respond within sixty days of receipt of this letter.

Sincerely, original signed by George W. Knighton, Director Project Directorate No.

5 Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation cc:

See next page DISTRIBUTION:

NRC 8 Local PDRs PDV Reading DCrutchfield GHolahan JLee RSamworth OGC-Bethesda EJordan JPartlow ACRS (10)

HNP-2 Plant GBagchi WLong CPTan RSP/PDV D

RSamworth G

hton 12/'P/87 12/

/87 OFFICIAL RECORD COPY

Request for Additional Information Generic Letter 87-05 Drywell Degradation Please provide the following:

1.

Provide drawings or sketches showing the drain lines from the refueling pool. including the connections between the drains and the refueling pool.

2.

Provide drawings or sketches of the sand cushion drains.

3.

Identify all pathways through which water may enter the air gap between the steel containment and the shield building.

4.

Identify the compressible isolation material which separates the steel containment from the concrete shield wall.

5.

Describe any signs or marks which you have observed on the shielding wall or the reactor building foundation floor which might indicate the presence of water.

6.

Describe all relevant actions you have taken after receipt of NRC Information Bulletin 86-99, issued

December, 1986.

7.

Provide the information requested by NRR Generic Letter 87-05, a copy of which is attached.

8.

Provide any other information which might help the staff determine without reservation the structural soundness of the WNP-2 containment with regard to this issue.

\\

'1

Yir. G.

C. Sorensen, Hanager Washington Public Power Supply System WPPSS Nuclear Project No.

2 (WNP-2)

CC:

Nicholas S.

Reynolds, Esq.

Bishop, Cook, Purcell 5 Reynolds 1200 Seventeenth

Street, N.W.

Washington, D.C.

20036 Hr.

G. E. Doupe, Esquire Washington Public Power Supply System P. 0.

Box 968 3000 George Washington Way

Richland, Washington 99532 Hr. Curtis Eschels, Chairman Energy Facility Site Evaluation Council Viail Stop PY-ll Olympia, Washington 98504 P. L. Powell, Licensing Hanager Washington Public Power Supply System P. 0.

Box 968, HD 956B

Richland, Washington 99352 Mr. A. Lee Oxsen Assistant Managing Director for Operations Washington Public Power Supply System P. 0.

Box 968, MD 1023

Richland, WA 99352 R.

B. Glasscock, Director Licensing and Assurance Washington Public Power Supply System P. 0.

Box 968 YiD 280 Richland, Washington 99352 Hr.

C. H. Powers WNP-2 Plant Manager Washington Public Power Supply System P. 0.

Box HD 927M Richland, Washington 99352 Regional Administrator, Region V

U.S. Nuclear Regulatory Commission 1450 Haria Lane, Suite 210 Walnut Creek, Cali fornia 94596 Chairman Benton County Board of Commissioners

Prosser, Washington 99350

November 24, 1987 DISTRIBUTION PDR PDR Docket PD 5 Rdg JLee DOCKET NO(S).

50-397 Mr. G. C. Sorensen, Manager Regulatory Programs Washington Public Power Supply System P 0 Box 968 Richland, Washington 99352 WASHINGTON PUBLIC POWER SUPPLY SYSTEM ~ WASHINGTON NUCLEAR PLANT Ho e 2 The following documents concerningour review of the subject facility are transmitted for your information.

Noti ce of Recei pt of Application, dated Draft/Final Environmental Statement, dated Notice of Availability of Draft/Final Environmental Statement, dated Safety Evaluation Report, or Supplement No.

dated Environmental Assessment and Finding of No Significant Impact, dated Notice of Consideration of Issuance of Facility Operating License or Amendment to Facility Operating License, dated Q Bi-Weekly Notice; Applications and Amendments to Operating Licenses Involving No Sig if'I*

d C

id i

d d~ f l l]

4 Exemption, dated Construction Permit-No.

CPPR-

, Amendment No.

dated Faci 1 ity Operating License No.

, Amendment No.

dated Order Extending Construction Completion Date, dated Monthly Operating Report for transmitted by letter dated

+ Annual/Semi-Annual Report-transmitted by letter dated Encl osures:

As stated Office of Nuclear Reactor Regulation CC:

See next page OFFICE)

SVIINAlAE 0ATEP

.JL

~

~ ~ ~

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ I ~ ~

~ ~ ~ ~ ~ ~ ~

.1U

~ 87o

~ ~

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

NRC FORM 318110i801 NRCM 0210 OFFICIAL RECORD COPY

t I

Yir. G. C. Sorensen, Manager Washington Public Power Supply System WPPSS Nuclear Project No.

2 (WNP-2)

CC:

Nicholas S. Reynolds, Esq.

Bishop, Cook, Purcell E Reynolds 1200 Seventeenth

Street, N.W.

Washington, D.C.

20036 Hr. G. E. Doupe, Esquire Washington Public Power Supply System P. 0.

Box 968 3000 George Washington Way

Richland, Washington 99532 Mr. Curtis Eschels, Chairman Energy Facility Site Evaluation Council Hai 1 Stop PY-ll Olympia, Washington 98504 P. L. Powell, Licensing Manager Washington Public Power Supply System P. 0.

Box 968, HD 956B Richland, Washington 99352 Mr. A. Lee Oxsen Assistant Managing Director for Operations Washington Public Power Supply System P. 0.

Box 968, HD 1023

Richland, WA 99352 R.

B. Glasscock, Director Licensing and Assurance Washington Public Power Supply System P. 0.

Box 968, YiD 280 Richland, Washington 99352 Hr. C. H. Powers WNP-2 Plant Manager Washington Public Power Supply System P. 0.

Box HD 927M Richland, Washington 99352 Regional Administrator, Region Y

U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Chairman Benton County Board of Commissioners

Prosser, Washington 99350

V

November 24'987 CI DISTRI3UTION PDR LPDR Docket PD 5 Rdg JLee DOCKET NO(S).

50-397 Hr G. C. Sorensen, Hanager Regulatory Progrnns Qaahington Public Power Supply Systen P

O aox 968 Richland, Haohington 99352 SUB J E CT e UASHIHGTOiI PUBLIC POHER SUPPXiY SYSTEM ~ 'PASQIUGTOH JKCLEAR PLAIT Uom 2 The following documents concerning our review of the subject facility are transmitted for your information.

Notice of Receipt of Application, dated Draft/Final Environmental Statement, dated Notice of Availability of Draft/Final Environmental Statement, dated Safety Evaluation Report, or Supplement No.

dated Environmental Assessment and Finding of No Significant Impact, dated Notice of Consideration of Issuance of Facility Operating License or Amendment to'acility Operating

License, dated

+ Hi-Weekly Notice; Applications and Amendments to Operating Licenses Involving No if'I*d C

id i,d d~f f)3 3

Exemption, dated Construction Permit No.

CPPR-

, Amendment No.

dated Facility Operating License No.

', Amendment No.

dated Order Extending Construction Completion Date, dated Monthly Operating Report for transmitted by letter dated Annual /Semi-Annual Report-transmitted by letter dated

Enclosures:

As stated cc:

See next page Office of Nuclear Reactor Regulation DQ /(D5 11I24 87

CC O.

J C

~

J J g d

II I

I H

E

)i

)

I II I

J b

r C

I k

J)

I,I

, t)

J

'F( g

)')JLd I

I

)

~ )

I CC I I

I

)

I I

"JC lt, JI C

I I

Mr. G.

C. Sorensen, Manager Washington Public Power Supply System WPPSS. Nuclear Project No.

2 (WNP-2).

CC:

Nicholas S. Reynolds, Esq.

Bishop, Cook, Purcell 5 Reynolds 1200 Seventeenth

Street, N.W.

Washington, D.C.

20036 Mr. G. E. Doupe, Esquire Washington Public Power Supply System P. 0.

Box 968 3000 George Washington Way

Richland, Washington 99532 Mr. Curtis Eschels, Chairman Energy Facility Site Evaluation Council Mail Stop PY-ll Olympia, Washington 98504 P. L. Powell, Licensing Manager Washington Public Power Supply System P. 0.

Box 968, MD 9560

Richland, Washington 99352 Mr. A. Lee Oxsen Assistant Managing Director for Operations Washington Public Power Supply System P. 0.

Box 968, MD 1023

Richland, WA 99352 R. B. Glasscock, Director Licensing and Assurance Washington Public Power Supply System P. 0.

Box 968, YiD 280 Richland, Washington 99352 Mr. C.

M. Powers WNP-2 Plant Manager Washington Public Power Supply System P. 0.

Box MD 927M Richland, Washington 99352 Regional Administrator, Region V

U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Walnut Creek, California 94596 Chairman Benton County Board of Commissioners

Prosser, Washington 99350

C I