ML20011D871
| ML20011D871 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 12/26/1989 |
| From: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Reed C COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML20005D906 | List: |
| References | |
| NUDOCS 9001020210 | |
| Download: ML20011D871 (2) | |
Text
.-
o
() t. O i
i DEC 2 619M Docket No. 50-457 Commonwealth Edison Company ATTN: Mr. Cordell Reed Senior Vice President Post Office Box 767 Chicago, IL 60690 I
Gentleman:
SUBJECT:
ENFORCEMENT DISCRETION ON BRAIDWOOD UNIT 2 RWST VENT TEMPERATURE l
REQUIREMENTS 7
~
We have reviewed your letter of December 23, 1989, which documents your December 22, 1989 oral request that NRC exercisa discretionary enforcement from the requirements of Technical Specification (TS) 3/4.5.4 regarding the t
refueling water storage tank (RWST) vent temperature. A copy of your letter is enclosed.
This TS surveillance requirement requires that you verify the RWST vent path temperature to be at least '35 degrees F when the outside air temperature is less than 35 degrees. At about 19% hours on December 22, you noted the Unit 2 RWST vent path temperature to be approximately 36 degrees and decreasing.
If the temperature had fallen below 35 degrees, you would have been required l
to enter TS 3.0.3 and implement a reactor shutdown.
We have reviewed your basis for your request for discretionary enforcement and find it acceptable. Discretionary enforcement was granted for_ a period of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> beginning at 2200 hours0.0255 days <br />0.611 hours <br />0.00364 weeks <br />8.371e-4 months <br /> on December 22, 1989, under the conditions described in your letter.
Sincerely, Oris mt1 r e d 4 A..Bert DavD l *$$
A. Bert Davis 8
Regional Administrator u,
L
Enclosure:
As stated Eo See Attached Pistribution
/
'Q\\
ks$
</
g e
e 1
(
r a
3 1
RIII(4-R R
[v R
RI RIIk RILI l l
(,
(
Clayton/jp Fo 1,ller ZW siG Grd$, Pape i llo Dav' s 12/2G/89 l
g yg q
p
)], y g,
c Commonwealth Edison Company 2 DEC t 61999 Distribution cc w/ enclosure:
T. J. Maiman, Vice President, PWR Operations T. Kovach, Nuclear Licensing Mar;ager S. Hunsader, Nuclear Licensing Administrator R. E. Querio, Station Manager D. E. Cooper, Regulatory Assurance Su DCD/DCB (RIDS)pervisor Licensing Fee Hanagement Branch i
Resident Inspector, RIII Braidwood Resident Inspector, RIII Byron D. W. Cassel, Jr., Esq.
Richard Hubbard J. W. McCaffrey, Chief, Public Utilities-Division I
H. S. Taylor, Quality Assurance Division E. Chan, OGC l
E. Reis, OGC Stephen P. Sands, NRR l
.i
BW/89-3215 i
,i 1
December 23,1989 Mr. A. Bert Davis Region til Adminletrator U.S. Nuclear Regulatory Commission 799 Roosevelt Road t
Glen Ellyn,IL 60137
Subject:
Braidwood Nuclear Power Station, Unit 2 Uoense No, NPF-77 1
i Confirmation of ErWorcement Discretion Technical C=N:o. 50-457--M;-ri 3/4.5.4 - Retuolin0 Water Storage Tank (RW NRC Docid 4
Referenoo: December 22,1989 telephone conference calls between NRC Region til and Braldwood Staton personnel.
l
Dear Mr. Davis:
1 i
to Breldwood Station Unit 2 durtThe purpose of this letter is to confirm the vert >al d Ta'rlor of USNRC Reclon lit and a phone converestion between Mosers. Clayton and Ed'aon, Braldwood Sfation. The discretio. Masters, Hoots and Miller of Commonwealth twenty-four hours beginning at 2200 hrs, on enforooment was grar,ted for a period of ber 22,1989. The rollef was limited to the RWST vent header temperature, whloh has a lower limit of 35'F por Toohnloal Spootfication ?/4.5.4.
At approximately 1800 hrs, on December 22,1989, the RWST vont heater temperature had dropped to sp aroximdtely 36*F, with a dooreaslog trend evident. This l
unusual circumstance is attrita ed to the extremely cold wsather prevalent over the past j
time to implement compensatory actions to leverse the decrea temperature,
'4 contingent on the completion of the following actions:This attuation w
^
- 1) Verify that no blockage in the vont heade~ exists.
- 2) Perform a safety evaluation documenting Go acoepteNihy of continued operation with a lower vent header temperature. Tnie evaluation shall be reviewed by the Onette Review and Inves'Jgative Function, 1
-j P
+me 1
1 3)
Shut down the unh H the RWST bulk water twnperature falls below the lower tirn!t.
- 4) Do not anow any load owings on the affected unit.
Braldwood Station :orsorinel have complied with the proviolons of the relief
, and these act one have been reviewed with the Station Manager. The Safety a
and Onske Review are atteobed.
Although the outdoor portion of the vent header is heat traoed, this alone was not sufficient protection against the extremely cold weather. At approximately 0030 hrs. a temporary ahoration was installed on the RWST roolroulation pum and heater. This temporary ahoration ellowed the hoster to run continuously, allowing the RWST water bpsi. ears to increase above the normal selpoint. As the watertemperature slowly increased, so did the vont header temperature due to the flee in RWST vapor space temperature.
The vent headertem soon after the comps,ma perature was monllered frequently throughout the night and sy measures were in place, the veGeee rg temperature trend was reversed. At no time did the vent header temperature drop bekiw the Tech. Spec.
Ilmit of 35'F. Therefore, entry into the Tech. Spec. Action Statement was never required.
As a result of this incident, Brahj Station is pursuing the actions necessary to preolude the recurrence of this altuation.
Braldwood Station is crateful to your staff for their timely response to our cold weather problem. Shouldhere be any questions on this matter, please contact D. Miller on extension 2702.
Respectfully submitted, e -,v t
R. E. Querlo ation Manager Braldwood Nuclear Station REQ /DJM/rm (15ZD71G) g oc:
T,gl. Malman K. L, Graesser T.J.Kovaoh S. O, Hunaader D, J. Miller i
w.
m
..