ML20058F404
| ML20058F404 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 10/27/1990 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML18153C421 | List: |
| References | |
| 90-674, NUDOCS 9011080266 | |
| Download: ML20058F404 (3) | |
Text
- _ - -
-, =. = - - - - -
~
- M f
L,,.- ". r.,OC7 27 '90 12827 rLD ENCLOSURE 1 c
c P.2/4 October 27,1990 United States Nuclear Regulatory Commission Serial No.
90 674 Region 11 101 Marietta Street, N. W.
NO/ETS i'
Suite 2900 Docket Noe. 60 280 Atlanta, Georgia 30323 50 261 Ucensa Nos. DPR.32 DPR 37
Dear Gentlemen:
.l VIRGINIA ELECTRIC AND POWER COMPANY t
SURR_Y POWER STATION UNITA 1 AND 2 J
RERVICE WATE 4/Al % CONDITIONING
, WAlVER OF COMIh ANCP
[
During Reolroulation Spray System service water flow testing on Unit 1, flow anomalies were identified wh!cn could Impact system operability. This resulted in the Unit 2 Recirculation Spray system being declared inoperable due to indeterminate
]
status. The unit was subsequently shut down.
The initialinspection resu'ts of the Service Water linos in Unit 1 indioated a significant
. growth of hydroids in the water filled 48 inch service water supply heacers. Inepection s
. of similar headers while water fil led will require use of a diver. To safely perform an inspection of the 48 inch eervice water eupply headers for Unit 2, a walver of compliance is being requested to secure certain flows while the diver la In the affected pipe.
Surry Technical Specification 3.14.C. requires that one service waur flow path be
. operating and one flow path be operable to support operation of the Main Control
- Room and Emergency Switchgear Room Air Conditioning System whenever fuelle in tne reactor for either unit. The two 48 inch headers in Unit 2 provide the service water for the Main Control Room and Emergency Switohgear Room Air Conditioning System
- through 8 inch branch lines upstream of the Recirculation Spray Servloe Water isolaten valves? To safety perform the inspection of these headers with divers, servloe
. water flow must be Isolated in these linee. The inspection process is expected to take
.approximately 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> per header. Therefore, we are requesting that a waiver of compliance be granted to allow-the required operable 6ervice water supply line be
. rendered Inoperable for one 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> period to perform the necessary Inspection. This
- request would be separately applied to each of the eight inch service water lines.
These inspections will be complete by 2400 on October 29,1990.
8 i.
s 9011080266 901029 PDR ADOCK 050002Qt t
P PDL
f*3 ENCLOSURE'1 cont'd
~
.ns OCT 27 '90 22:28 ft.D P.3/4 SAFETY IMPACT AND POTFNTIAL CONMOUENCES -
. Based on operatino experiences, a total loss of control room chillers for periode 9
greater than thirty minutes has not caused design base bulk air temperatures to be exceeded. With both Units shutdown the heat loads for a00ident conditions are not applicable. Administrative controls will be placed on the isolated valve for the operable line requiring the diver to terminate the 48 inch header inspection and flow to be i
establiehod in the isolated 8 inch line within thirty minutes. This provides ample tirne for the diver (s) to leave the service water header, it is imponant to note that both the -
i operating and operable 8 Inch lines are a newly installed, seismically qualified.
missile protected passive subsystem. Failure of this subsystem is considered to be
. Very unlikely.We cherefore conclude that there is no impoot on nuclear safely or -
Increased accident consequences as a result of this request.
RICNIFICANT HA7ARDS CONSIDERATION
' The proposed walver of oompliance to allow only one servlce water supply line to the L
' air conditioning ch!Ilers for the Main Control and Emergency Switchgear Rooms to be inoperable does not result 10 a sign!ficant hazards consideration.
1.
Tho' requested walver does not significantly increase the probability or consequences of an accident previously ovaluated. The consequences of the accident will not change. '
- probability of a loss of service water to Emer0ency Swlich0 ear and Control Room alt conditioning will increase;.
however, based on previous operatino experiences, sufficient time is available to re establish flow in the inoperable service water line without exceeding L'
design temperature limits in these areas thereby. eliminating any potential equipment instability or failure as a tsult of this activity.
- Thebroposed walver will not oreate the possibility of a new or different kind of 2.
L acci nt from any ac Ident previously evaluated. Bulk air temperatures will be L
maintained with design limits. No new accident precursors are Generated. The L
plant is in cold shutdown and will be operated in the same manner.
3.
The proposed change does not involve a significant reduction in a margin of -
l safety. The heat loads are low enough to allow ample time to reestablish l
service water flow and ensure bulk air temperatures are maintained within design. Therefore, the safety margin in any desion base accicnt analyses is p
not affected by this request.
1
,+
f e
i I'
l-i 4
4 t'
v
^
. OCT 27 '9012829 ft.D P'd'4
, 1,
.' ' ENCLOSURE 1 cont'd ENVlFloNurNTAI coNesOUENcart ThIs waiver Will not chan09 the types of any effluents that may be create a significant incroace in Individual or cumulative occupallonal radiat u
exposure.
This waiver of compilance has been reviewed by the Station Nuclear S Operating Committee and it has been determined that no unroviewe or eignificant hazards consideration exist.
Very trulyyours, 1
b
.5A
. L Stewart nior Vice President Nuclear -
Attachments United States Nuclear Regulatory Commission oo:
Attention: Document Control Desk Washington, D.C. 20666 Mr. W. E. Holland V
NRC Senior Resident inspector Surry Power Station j;
e
'I i
i,4 l:
[ e' vi it.:
l l.:
o l-
-[
t l!
I,
'a 4
9-4 y
8 g
k
-