ML20126A888

Supplements 790702 Response to IE Bulletin 79-01, Environ Qualification of Class IE Equipment. Addl Info on Potentially Unqualified Items,Chiller Equipment for Control & Relay Room & Safeguards Bldg Ventilation Pass Encl

ML20126A888
Person / Time
Site:	North Anna
Issue date:	08/13/1979
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Stello V NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
Shared Package
ML20126A875	List: ML20126A871 ML20126A888 ML20126A893
References
IEB-79-01, IEB-79-1, NUDOCS 8002260725
Download: ML20126A888 (5)

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   ' bc    Mr. C. M. Stallings                           Mr. B. R. Sylvia Mr. J. A. Ahladas                             Mr. E. A. Baum O-        Mr. W. C. De1er                               nr. a. t. rerxins August 13, 1979 Mr. Victor Stelle, Jr. , Director                             Serial No. 90B Division of Reactor Operations Inspection                     PO/FMT:scj Office of Inspection and Enforcennnt                          Dx:ket No. 50-338 U.S. Nuclear Regulatory Comnission                            License No. NPF-4 Washington, D.C. 20555

SUBJECT:

I.E. BULIEPIN 79-01 NORIH ANNA IOWER STATION UNIT NO. 1

Dear Mr. Stello:

1his letter in in response to IE Bulletin 79-01, "Environnnntal Qualification of Class IE Equipment", and is a supplement to our earlier response, Serial l No. 90A, dated July 2, 1979. , 1 As noted in our July 2, 1979 letter, the following two potentially unqualified items were identified during our review of qualification information:

1. Chiller Equignent used for control and relay room air conditioning.

2. Safeguards Building Ventilation Pass.

Mditional infonnation on these items is included in attachments 1 and 2. Wb also stated in our July 2, 1979 letter, that we were pursuing NSSS vendor- l supplied safety-related qualification documentation and had made arrangemants i to receive additional information from our NSSS vendor. We have received a  ! listing of references which provide qualification information (see attachment 3). We are .providing this documentation to our A-E whom we have directed to perform a review to determine the qualification status of NSSS vendor supplied equipuent. This review is now well underway, and we will forward the results as soon as they are available. Very truly yours, M C. M. Stallings Vice President-Power D.1oply and Production Operations cc: Mr. James P. O'Reilly, Director Office of Inspection and Enforcem2nt Region II

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-s* s' Attachment 1 i

1. Equipment Description & Mark No.

A. Control & Relay Room' A/C Chillers Westinghouse; 1--HV-E-4 A , B , C ; P. O. NA247; located in Chiller Room. B. Air Conditioning Self Clean'ihg Strainers , Elliot Company; 1-HV-S-1A, B; P. O. NA-299; located in Chiller Room. C. Motor Operated Valves - Fisher Covernor Company - Continental Division - Field P. O. - Natkin No. 8514-A-2008, located in charcoal

              ,             filter duct from Chiller Room. Intakes - 30 minutes.

D. Motor Operated Valves - Elliot Company 1-MOV-HV-115-1,2 1-MOV-HV-116-1,2 P. O. NA-299 locate in Chiller Room as components of self-c1 caning strainers. E. In-Line Pumps - Air Conditioning - Bingha=-Williamette Company 1-HV-P-20A,B, C; 1-HV-P-22A,B,C; P. O. HA-276; located in Chiller Room.

2. Qualification Deficiencies Equipment potentially not qualified for exposure.

{ A. 111gh ambient temperature 211 F , , i B. Saturated atmosphere, 100% R.H. (Typical for all equipment listed on this page).

3. Resolution Use equipment in unaffected Unit to maintain Control Room environment.

4. Justification for Resolution ,

In the event of a main steam line break (MSLB) in either turbine build-ing and the corresponding failure of a main steam stop valve to shut, the temperature in the control room A/C chiller room will approach 180 F at 100% relative humidity due to steam blowdown entering the chiller room. A/C chiller systems have not been qualified to withstand these

                ,      environmental conditions.                               ,

In order to maintain habitabic temperatures in both Units' control rooms under the above conditions it is necessary.to operate two A/C chillers in the unaffected unit. - 1 Continued operation of Unit I can be justified on the basis of always having two Unit 2 A/C Chillers, one Unit 2 cmergency diesel generator and the two Unit 2 cmcrgency busses availabic. . Since the analysis

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assumes that a main s' team trip valve fails to shut, no other single l failure need be postulated per Regulatory Guide 1.81. Therefore, only I one Unit 2 diesel generator need be available to operate two A/C l chillers (this requires tying emergency buses 2H and 2J). l 1 l l 4 1 l 1 e 6 1 I l 1 1 (

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Attachment 2

1. Equipment Description & tbrk No.

Axial Flow Pans - Joy PTg. Co. ,. P. O. No. NA-201; 1-HV-F-71 A,B located in Saf eguards Bldg. -

2. Qualification Deficiencies  !

Equipment potentially not qualified for c'xposure to: 6 A. Radiation - 1 x 10 rads

3. Resolution Replace with qualified motors.

4. Justification for Unit Operation Until Motor Replacement ,

Fans 1-H7-F-71A and B have been installed to provide ventilation to l cach recirculating spray pump and safety injection pump cubicle follow-

      .                       ing a design basis accident (LOCA) and subsequent loss of exhaust re-sulting from a tornado-missile which may occur 24 hours following a LOCA. In the event of a LOCA, the safeguards area ventilating fans                                                                  l 1-HV-F-71A and B are potentially not qualified to withstand the re-                                                                   !
   -{'                        sulting radioactivity and may become inoperable.

Continued plant operation until a qualified motor can be obtained is justified since the probability of a design basis accident (LOCA) followed by a tornado is less than 10E - 7. (Reference NuReg 75-087) .

5. Schedule

• A Icad time of 26 to 28 weeks is required, af ter release for fabrica-tion, to obtain a qualified replacement motor. New motors will be in-stalled as soon as they are available.

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[ . 4 .I. i . j l 1 Attachment 3 ( l North Anna Unit No. 1 NSSS Vendor Supplied Safety-Related IE Equipment Oualification References Function Manufacture /Model Qualification Reference ) l

1. Steam Flow Rosemount/1152 DP Rosemount Test Report 117415 l Rev. A, 9-24-75

2. Pressurizer Barton/763 NS-T!!A-1950 Submitted to Pressure (Lot 1) NRC 9-29-78. l

3. Pressurizer Barton/764 NS-CE-1384 Submitted to Level (Prototype) ,

NRC 3-23-77

4. RCS Pressure Barton/763 NS-CE-1384 submitted to I vide range (Prototype) NRC 3-23-77.

5. Wide Range Rosemount/176KS WCAP 9157 RTDs  !

6. Narrow Range Rosemount/176KF WCAP 9157 i RTDs j

7. Narrow Eange Rosemount/1152DP Same as 1 above S/G Level .

8. Valve Motor Limitorque/StiB WCAP 7744 Operators NS-CE-69 2, 7-10-75 NS-CE-756, 8-15-75 NS-CE-84 7, 11-24-75 O e e

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