ML19331D145
| ML19331D145 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 08/21/1980 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-80-18, NUDOCS 8008270371 | |
| Download: ML19331D145 (2) | |
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BALTIMORE GAS AND ELECTRIC COMPANY P. O. BOX 147 5 B ALTI MO R E. M ARYLAN D 21203 August 21, 1980 ARTMum E. LUNOVALL.Ja.
WCC Paggiogwt S u p*Lv Mr. Poyce H. Grier, Director Pecion I, Office of Inspection and Enforcemer.t U. S. "uclear Peculatory Comnission 631 Park Avenue Einc of Pruscia, PA 10h06
Subject:
Calvert Cliffs Dielear Power Plant Units Nos.1 L 'i, Dockets !!os. 50-317 & 50-318 I? Pulletin 80-18 Pear Mr. Grier:
IE Bulletin 80-18 addressed a situation where the safety injection pumps could start when the pressure in the Pesctor Coolant Systen (PCS) was above the discharce head of the nunns.
If adequate mininum flow is not naintained through the nump, damage micht result that could adversely affect the nunn's availability prior to safety injection terrination criteria being met.
The bulletin directed us to nerforn calculations to determine if this nroblem could exist at Calvert Cliffs. However, due to the desicn conficuration of the safety injection cysten at Calvert Cliffs these calculations vere not necessary.
Upon initiation of a Safety Injection Actuatien Signal (SIAS),
two Hich Pressure Safety Injection (HPSI) pumus and both Low Pressure Safety Injection (LPSI) punes vill start. The SIAS is initiated by either a tressure switch for pressurizer pressure or for containment pressure. A recirculation line is nrovided for the "DSI* and LPSI nu=ps.
"'here are two valves in this line which are normally open and fail as is.
Therefore, if the nressure in the RCS is above the shutoff head of the pumn no damage vould result because of the recirculation flow.
The safety injection nurms take suction from the Refueling Water Tank (RWT) and vill commence dischargine to the RCS when reactor coolant uressure drons below the shutoff head of the HPSI nunps. At this point, the mininun flow line for the HPSI pumns is not required because the discharge flow fron the pump to the RCS is more than adequate. However, the minimum flow recirculation line valves remain onen because the FCS nressure may still be above the shutoff head of the LPSI nurps. When the FWT emoties a Fecirculation Actuation Signal (RAS) initiates, which stops the LPSI pumps, shuts the mininum flow reeirculation line valves, and lines up the HPS!
nunos to take suction frnn the containrent sump. With the LPSI pumus secured and the RPGI n':mus in the recirculatien mode between the containment and the RC3 the mininum flow recirculation line is no longer required sunn and is inclated st this noint so as not to divert HPSI numn flow back to the RWT.
Procedures at the niant require the onerstors to ensure that there is always adequate minimum flow for the safety inf ection pumns.
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P Mr. 3. H. Grier Page 2 August 21, 1080.
All safety related analyses assumed the presence of this recirculation flow path.
As requested by the bulletin,17 manhours were spent in conducting this review and 0 manhours for corrective action. Should you have any questions rerarding this renly, we vill be nicased to discuss them with you.
Very truly yours,
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J. A. 3tddison, Escuire G. 7 Trowbridae, Escuire "esnrs. E. L. Conner Jr. - NRC /
a J. W. Prothers - Bechtel R. E. Architzel
'.'"C Division of Peactor Construction Insnection Of" ice o' Tnspection ud Fnforce. ent n
'.'achinten, D. C.
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