ML20070C910
| ML20070C910 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 12/09/1982 |
| From: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.E.4.2, TASK-TM NUDOCS 8212140385 | |
| Download: ML20070C910 (2) | |
Text
v
/
/
- , 'n' t
i l
PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET T
,/
P.O. BOX 8699 PHILADELPHI A. PA.19101 SHIELDS L DALTROFF
)/
stacim c PP og A
1 4/(
l December 9, 1982 g,
RE:
Docket No. 50-277 5
l 1
Mr. John F. Stolz, Chief g
s Operating Reactors Branch #4 Division of Licensing s
U.S. Nuclear Regulatory Commission Washington, DC 20555
( 'l
'i
Dear Mr. Stolz:
,)
s This letter requests relief from our comm'itmrtnt made by I
letter from S. L. Daltroff, Vice President, Philadelphia ElectUic Company to Mr. T. A.
Ippolito, Chief, Operating Reactor,s* Branch j
3, on December 11, 1979, with respect to containment' purgeand vent valve operation.
s The commitment made in the December 11 letter was thath the large diameter purge / vent valves on the Peach Botkom Ubits' would not be used for containment purging and ventida in excess of 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> per year with the reactor at power.
We a'rethaking this request since we are within approximately 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> tif that limit and feel that it is important to safety to be able to make an inspection in the drywell with the reactor system at approximately 500 psig.
Because Unit 2 may shutdown later today to effect repairs to a main oteam relief valve, we are requesting expedited relief from this commitment.
Your letter of July 7, 1982 to the Philadelphia Electric Company concerning the status of containment purging and venting, and completion of NUREG 0737, Item II.E.4.2, contained an enclosure (4) which addresses the use of the c5ntainment purge and venting valves beyond the 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br />'per year, under heading I f,
BTP-CSB 6.4 position B.4 amplification.
i ki h We have reviewed enclosure (4) with respect to item (2) and submit that the need for this additional purge / vent time is F'
justified for safety purposes in that it,will allow us to perform a visual inspection for steam leaks within the drywell associated with the impending shutdown as an added assurance of primary boundary integrity.
s
~
8212140385 321209 4
DR ADOCK 05000277 PDR
f
~
Mr. John F.
Stolz Page 2
In support of this request, we offer the following information:
1.
If a LOCA were to occur during the limited period of time that the containment purge and vent valves were open, the offsite doses resulting from the coolant / gas moisture escaping from the primary containment during the valve closure period (<5 seconds) would be substartially below 10CFR100 guidelines.
Our analysis has included the assumption of an iodine spike resulting in coolant activity levels substantially in excess of Technical Specification limits 2.
Adequate assurance of valve operability (closure) has been provided in our August 26, 1982 submittal to you on this subject.
3.
As stated in point 16 of the Summary Report transmitted with the August 26 letter, duct or filter overpressure failures would not be expected with the purge valves in their present condition (i.e. s limited to <40 degrees open) and there would be no increase in risk above that predicted in WASH-1400.
4.
The Operations and Safety Review Committee concurs with this request.
' Based on the above, an extension of the annual purge
,_ nitation for PBAPS Unit 2 beyond 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> per year is justified from a safety viewpoint to allow an inspection in the drywell of the, primary system during low power operations at approximately 500 psig.
We will continue to minimize our purging and venting at po er'as previously committed.
If you have any questions or require further information on this subject,'please do not hesitate to contact us.
s T
r, Very truly yours,
/ l
/
g([/[w cc:
Site Inspector.
(l Peach Bottom V
t l
l t
. - _ _