ML18046A787
| ML18046A787 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 06/30/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| TASK-06-07.B, TASK-6-7.B, TASK-RR LSO5-81-06-132, LSO5-81-6-132, NUDOCS 8107130456 | |
| Download: ML18046A787 (4) | |
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Dock~t No. 50-255 LS05-81-06-132 Mr. David P. Hoffman June 30, 1981 Nuclear L tcenstng Administrator Consumers Power Company 1945 W~ Parnall Road.
- Jackson, Michigan 49201
Dear Mr. Hoffman:
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SUBJECT:
PALISADES SEP TOPIC VI-7.B ESF SWITCHOVER FROM INJECTION TO RECIRCULATION MODE (AUTOMATIC ECCS REALIGNMENT)
On May 19, 1981, the staff transmitted a safety evaluation of Topic VI-7.B, based on contractor reports on the instrumentation and control systems used to per.fonn the switchover.
The staff has also cQnsidered the switchover f"2m the standpoint of compo-nent redundancy and. net positive suction head (~~PSH). Our evaluation of these aspects is enclosed.
- Y*sased on these assessments, we conCl ude* that your fac11 i_ty meets '~u.rrent 11cetis fog criteria for this topic and therefore, we cone lude that*~lth1 s topt c ts complete.
E~los1,1re:
(\\s:'"'stated cc w/encl@sure:
See next page Sincerely, Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing r--
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ENCLOSURE
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ESF Switchover from Injection to Recirculation Mode (VI~7.~)
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Introduction.
Following a loss of coolant accident '(LOCA), *safety ~in&ection 'is automatically
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initiated ~y..a safety injection signahfSIS}.: *rhe. sis' starts the high and
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1 ow P\\_essure inject ion pumps and,~pens the safety.. injection valves.
Water
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. *supply for safety injection is ;,nitially provided bi 1the safet}' injection
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and refueling water (SIRW) tank.
When the water in the SIR~~ tank reaches a predetermined low ]evei~ a'recir~u1~tion#~ctuation signal (RAS) opens the containment sump valves (to realig*n-*water sup.ply)~ closes the SIRW tank valves, stops the low-pressure pumps and closes the valves in the pump minimum flow lines..
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E v a 1 u a ti on The injection and recirculation paths have t~o emergency cooling-water loops that *receive water from the SIRW tank dur:.irig i.njection, and from the con-tainment sump during recirculation.
During injection, with all injection.
and containment spray pumps running, the SIRW tank will provi~e approxi~ately 2~ minutes supply of water before pump suction must be switched to the con-tainment sump..
During realignment of water supply from the SJRW to the cont~inment sump, a one-minute overlapping stroke is provided to allow.mixing and assure adequate NPSH during the transfer.
Ccimp6nent redundancy in the injection and recirculation paths precludes loss of core or containment cooling capability, from failure of any single component.
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- 2 III. *Conclusion As part of the SEP review for the P~lisades Plant, we have evaluated the licensee's sa~ety injection system design (Ref. l) against the criteria of SRP Section 6.3, Branch.Technical Position RSB 6-l, and ha~e concluded that the design is in conformance with those criter~a.
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3 REFERENCES
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1.* Consumer Power Company, "Final Safety/Analysis Rep;prt,Palisades Plant,*
Docket No: 50-255..
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