ML20052H698
| ML20052H698 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 05/17/1982 |
| From: | Olson R BALTIMORE GAS & ELECTRIC CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8205210350 | |
| Download: ML20052H698 (2) | |
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I BALTIMORE GAS AND ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE. MARYLAND 21203 ELECTaic ENGINEERING DEPARWENT pgy 17, 1g82 Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Cornission Washington, D. C.
20555 Attn:
Mr. Robert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing
Subject:
Calvert Cliffs Nuclear Power Plant Units Nos. 1 & 2; Docket Nos. 50-317 & 50-318 Boron Precipitation During Long Term ECCS Operation Feference : Letter from J. W. Gore, Jr. to D. L. Ziemann dated April 16, 1975 Gentlemen:
As a result of conversations with Mr. D.H. Jaffe of your staff, we are providing additional information concerning the prevention of boron precipitation in the reactor vessel during long-term ECCS operation. Attached are descriptions of the primary and alternate flushing flow paths which vill be used to preclude boron precipitation. We are also enclosing with Mr. Jaffe's copy of this letter (only) copies of the drawings which show those flow pDs:
BG&E Dwg. 60-729-E (OM-72)
BG&E Dwg. 60-730-E (OM-73)
BG&E Dwg. 60-731-E (OM-Th)
If you require additional copies of these drawings or would like to discuss this information, please have Mr. Jaffe contact us.
Very tr y yours, R. C. M son Principal Engineer Nuclear Licensing & Analysis Unit RCLO/klb
/
Enclosures 4
s cc:
J. A. Biddison, Esquire I /
G. F. Trowbridge, Esquire Mr. D. H. Jaffe - NRC Mr. R. E. Architzel - NRC l
8205210350 820517 l
DR ADOCK 05000317 p
l PDR
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s ATTACHMErf 1
The primary procedure (hot leg injection) promotes flov through 4
the core by establishing a flow path from the Containment Sump through the Lov Pressare Safety Injection System via the varm-up line to the Shutdown Cooling suction line and into the hot leg.
More specifically, flushing water flows through the following path:
from the containment sump (Refer to Dwg. OM-Th) lI through valve MOV b1kh or MOV b1h5 (Containment sump discharge valves, opened by RAS) through LPSI pump #11 and 1-SI-hkT (locked open) or LPSI pump #12 and 1-SI h35 (locked open) i through CV-306 (LPSI flow control valve) through FE-306 through FE-332 through MOV-399 (newly installed - opened by Control Room Operator) through SI h00 (which is locked open) through MOV-651 and MOV-652 (SDC return header i
isolation valves) into RCS hot leg #12 j
(OM-72) and into the vessel.
l The alternate procedure (pressurizer injection) is used in the j
unlikely event that the primary flovpath is unavailable.
Core flushing is provided by diverting a portion of HPSI flow into the hot leg via the pressurizer auxiliary spray line and surge line.
More specifically, water flows through the following path; from the common discharge of HPSI pumps 11,12 & 13 (Dwg. OM-Th) through line 6" DC-1-1009 through MOV 656 (HPSI header isolation valve, opened i
by SIAS) through lines 6" CC-6-1001 and 2" CC-6-1003 (Dvg. OM-73 j
zone G-1) through MOV-269 (newly-installed bypass around CVC-269 &270)-
down the line and-through CVC-182 upline 2" CC-7-1001 through FE-212 and CVC-188 through the regenerative heat exchanger 4
I through CV-517-(auxiliary spray line control valve) and CVC-389.
through the auxiliary spray line (Dwg. OM-72 zone B-8) into the pressurizer through the Tressurizer surge line i'
into RCS hot leg #11 and into the vessel i
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