ML20045D432

Suppl to 920624 Application for Amend to License NPF-58, Increasing Max Average Suppression Pool Water Temp & Containment Average Air Temp Limits from 90 F to 95 F to Permit Continued Plant Operation

ML20045D432
Person / Time
Site:	Perry
Issue date:	06/21/1993
From:	Stratman R CENTERIOR ENERGY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20045D433	List: ML20045D432 ML20045D434
References
PY-CEI-NRR-1663, NUDOCS 9306290023
Download: ML20045D432 (2)

Text

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I CENTE DR3 ENERGY PERRY NUCLEAR POWER PLANT Mail Address:

P.O BOX 97 Robert A. Stratman 10 CENTER RdAD PERRY, OHIO 44081 VICE PRESIDENT - NUCLEAR PERRY, OHIO 44081 (216) 259 7 37 June 21, 1993 PY-CEI/NRR-1663 L U. S. Nuclear Regulatory Commission Document Control Desk l Vashington, D. C. 20555 Perry Nuclear Power Plant '

Docket No. 50-440

Request for Issuance of the Increased

! Containment Air and Suppression Pool Vater Temperature Portions of the Containment Response Analysis Technical Specification Change ,

Gentlemen:

Technical Specification 3.6.3.1, "Depressurization Systems - Suppression Pool,"

provides an Action statement requiring plant shutdown in the event the suppression pool temperature exceeds 90*F for greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Another Action statement within Specification 3.6.1.7, " Primary Containment Average Air Temperature," requires a plant shutdown in the event that the containment air '

temperature cannot be reduced to less than the limit of 90'F vithin 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

Following exceedance of these time limits for returning to within limits, both '

specifications require HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and COLD SHUTDOVN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

Seasonal high ambient temperatures in Lake Erie, which supplies the emergency service water system (which provides the source of cooling vater to the residual heat removal (RHR) system heat exchangers for suppression pool cooling) lovers the available delta-T between the suppression pool and the RHR heat exchangers and the ability to reject heat from the pool. Also, heat sources which discharge to the suppression pool increase the suppression pool '

temperature. The suppression pool acts as a heat sink and therefore also has a large influence on the containment air temperature. Since the containment air temperature is higher in the summer months, it also' places an increased load on the containment chiller system, which then may often be forced to run in its maximum six-fan (versus normal four-fan) operating configuration to maintain the containment air temperature within limits. Thus, the containment air temperature is also indirectly influenced by high ambient lake temperatures and to a lesser extent by outside ambient air temperature. These effects can result in extended operation of the suppression pool cooling mode of the RHR system and the containment chillers and, if the suppression pool and/or containment air temperature cannot be reduced to within limits, can result in a forced plant shutdown.

Since these temperature problems are recurrent, a permanent Technical Specification change to increase the suppression pool and containment air temperature limits from 90 to 95'F vas requested (along with several other f

Operating Componies f v.ciand Electne H!umi otrg Toledo Ed: son *3 M b b b 's 9306290023 930621 )

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USNRC June 21, 1993 PY-CEI/NRR-1663 L proposed Technical. Specification changes) in letter PY-CEI/NRR-1510L, dated June 24, 1992. This change request was published in the Federal Register on July 1, 1992 for public notice and comment (57 FR 29337).

Due to the possibility of high ambient air and Lake Erie temperatures it is requested that the portions of the License Amendment Request within letter PY-CEI/NRR-1510L, involving increasing the maximum average suppression pool vater temperature and the containment average air temperature limits from 90 to 95"F be issued to permit continued operation of PNPP Unit 1 this summer. Note, however, that the Cleveland Electric Illuminating Company (CEI) still requests that the full scope of changes described in the above referenced letter be issued by October 1, 1993 to support preparations for the fourth refuel outage.

As described in the previously referenced letter, CEI performed a containment-response and structural analysis review to determine the effect of changing certain input conditions (primarily those concerned with temperature) on the associated safety analyses. Results indicated that there was sufficient margin within the containment design to revise the Technical Specification operational limits for several parameters while still remaining within the acceptance criteria (design limits) of the safety analyses. Therefore, that set of analyses are applicable and bound the results obtained for this scenario (of only implementing the temperature limit increases) for the containment air and suppression pool water temperatures. Consequently, the Significant Hazards Evaluation performed in letter PY-CEI/NRR-1510L (see Item I. within the referenced letter for that evaluation) remains valid and bounds the results obtained for the above temperature changes being made. Also, the Environmental Considerations evaluation performed in letter PY-CEI/NRR-1510L remains valid for the same reason.

Attachment 1 provides a listing (for convenience) which restates only those-Technical Specification changes necessary to implement a change in the containment air and suppression pool temperatures from 90 to 95'F.  :

Attachment 2 provides a Cross-Reference Table which denotes the Sections of I letter PY-CEI/NRR-1510L that are applicable (and clarifies the degree of applicability).

If you have any questions, please feel free to call.

Since y, e Q

< ober't A. Stratman RAS:RAL:ss Attachments cc: NRC Project Manager NRC Resident Inspector Office NRC Region III State of Ohio

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