ML20210S793
| ML20210S793 | |
| Person / Time | |
|---|---|
| Site: | Satsop |
| Issue date: | 05/06/1976 |
| From: | Minners W Office of Nuclear Reactor Regulation |
| To: | Deyoung R Office of Nuclear Reactor Regulation |
| References | |
| CON-WNP-1637 NUDOCS 8605290406 | |
| Download: ML20210S793 (4) | |
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Richard C. DeYoung, Jr., Assistant Director for LWR's, DPM THRU: Thomas M. Novak Chief. Reactor Systems Branch, DSS f
WPPSS 3/5 SER SUPPLEMENT Plaat fiame: WPPSS 3/5 Dc:ket No.: 50-508/509 i
Milestone No.: 27-21 Licensing Stage: CP Restonsible Branch & Project Leader: LWR-3. A. Ecurnia Systems Safety Branch In ulved: Reactor Systems Branch Description of Review: I,ER Supplerent Rr; quested Completion Date: May 7, 1976 Feview Status: Complete The ACRS at its 192nd meetin.g rer.cnsnended that if sir,nificant further ECCS improvements car be achieved, consideration should be given to incorporating them into WPFSS 3/5.
The enclosure discusses t'ae generic studies undenay to develop im-proved ECCS systemf..
Karren Misr.ers. Seccion Leader Reactor Systers Branch Divistor, of Sptens Safety Office of Nuclear Reactor Regulation l
Ent.losure:
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The NRC staff and several vendors are conducting studies to better define the current safety margins associated with emergency core cooling systems. More specifically, we are holding generic discussions with Combustion Engineering regarding the concept of combined hot er.d
. cold side ECCS injection. The combined injection system presently being evaluated by Combustion Engineerine is rimilar in concept.to the Westinghouse upper hecd injection ECCS design, however, the present Combustion Engineering concept utilizes lower pressure injection tanks, and injection into,the upper head would occur after blowdown.
Current efforts then are aimed at determining if upper head injection in Combustion Engineering plants would bring about significant im-provement in the reflood period after a LOCA. Experiments to l determine the effectiver.ess of alternate emergency core cooling in-jection modes such as these are planned to be performed at the Semiscale test facility.
The Nuclear Regulatory Commission is also developing advanced computer models for ECCS performance evaluation.
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UNITED STATES j
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W 0 G Iys Richard C. DeYoung, Jr.,-Assistant Director for LWR's, OPM
- THRU: Thomas M. Novak, Chief, Reactor Systems Branch, DSS WPFSS 3/5 SER St>PPLEMENT Plant Name: WPPSS 3/S Docket No.: 50-508/509 Milestonc No.: 27-21 Licer. sing Stage: CP Responsible Branch & Project Leader: LWR-3, A. Bournia Systems Safety Branch Involved: Reacter Systems Branch Description of Review: SER Supplercent Requested Completion Date: May 7,1976 Review Status: Complete The ACRS at its 192nd freeting recommended that if significant further ECCS improvements can be achieved, consideration should be given to incorporating them into WPPSS 3/5.
The enclosure discusses the generic studies underway to develop im-proved ECCS systems.
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Warren Minners, Section Leader Reactor Systems Branch Division of Systems Safety Office of Nuclear Reactor Regulation
Enclosure:
SER Supplement cc:
S. Hanauer R. Heineman D. Ross
- 0. Parr T. Novak W. Minners A. Thadani A. Bournia 1
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2 4 I-WPPSS 3/5 SER SUPPLEMENT Docket Nos. 50-508/509 The NRC staff and several vendors are conducting studies to better define the current safety margins associated with emergency core cooling systems. Ihre specifically, we are holding generic discussions with Cembustion Engineering regarding the concept cf combined hot and cold side ECCS injection. The combined injection system presently being evaluated by Combustion Engineering is similar in concept to the Westinghouse upper head injection ECCS design, hcwever, the present Combustion Engineering concept utilizcs lower pressure injection tanks, and injection into the upper head would occur after blowdown.
Current efforts then are aimed at determining if upper head injection in Combustion Engineering plants would bring about significsnt im-provement in the.reflood period after a LCCA. Experiments to datermine the effectiveness of alterciate emergency core cooling in-jecticn modes such as these are planned to be performed at the
. Semiscale test facility.
The Nuclear Regulatory Commission is also developing advanced computer models for ECCS performance evaluation.
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