ML19210C117
| ML19210C117 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 11/09/1979 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Reid R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19210C118 | List: |
| References | |
| NUDOCS 7911130297 | |
| Download: ML19210C117 (11) | |
Text
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BALTIMORE GAS AN D ELECTRIC CO M PANY GAS AN D ELECTRIC BUILDING B ALT l M O R E, M A RYLAN D 21203 Amun E. LvNovALL,JR.
November 9, 1979 V Ct Pntsiotmf Su pese Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Attn:
Mr. Robert W. Reid, Chief Operating Reactors Branch #h Division of Operating Reactors
Subject:
Calvert Cliffs Nuclear Power Plant Units Nos. 1 & 2, Dockets Nos. 50-317 & 50-318 Follov Un Actions Resulting from TMI-2 Incident Gentlemen:
Mr. H. R. Denton's letter of 10/30/79 identifies control grade automatic initiation of auxiliary feed (NUREG 0578 Section 2.1.7a) as requiring " proposal retiew" by NRC prior to implementation. Your staff's initial review of modifications proposed in our letter of 10/19/79 resulted in comments telephoned to us on 10/26/79 This letter provides a descrip-tion of our revised proposed modifications. Your approval of our design as submitted is required by 12/10/79 in order to maintain our schedule; of course, any changes to our design required '
ou will likely affect the completion date.
The existing auxiliary feedvater system is shovu on enclosure No. 1.
Note that the steam supply to the auxiliary feed pump turbines is under operator control through handsvitches HSh070 and HSh071 located in the control room on the condensate and feedvater panel. To roll the auxiliary feed pump turbines the control room operator moves either or both handsvitches to the open position.
Enclosure No. 2 shows the schematic for control of MOV h070.
The schematic for control of MOV 4071 is similar.
Control of feed flow rate is also remote manual through hand-indicating-controllers located on the condensate and feedvater panel in the control room.
Each auxiliary feedvater regulating control valve and the speed of each auxiliary feed pump turbine is under operator control via a hand-indicating controller.
Design has been completed to modify the control of the motor operated auxiliary feed pumn turbine steam supply valves.
The proposed design change opens both steam supply valves when main feed to either steam generator drops below a minimum value, while retainine operator control of initiation of auxiliary feed.
Enclosure No. 3 shows the proposed new control schematic for the steam supply MOV's.
Note that new hand-switches are needed. The auto start signals designated AFASAX and AFASEX on enclosure No. 3 are outputs from bistables installed in the main feed flow signal loops.
These bistables ar finaqf JY-llllB and FY-ll21B on enclosuro No. 5 t
9 7911130 1P '
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1 E 4 Mr. R. W. Reid November 8, 1979 The auto start feature can be tested by the following procedure:
1.
Operator verifies auxiliary feedvater regulating valves are closed.
2.
Operator places main feed regulating system in manual.
3.
A signal simulating feed flow is applied to the feed flow square root extractor through test jack J2.
The corresponding flow rate is observable on the steam and feedvater flow recorder.
h.
The test signal level is reduced to the bistable setpoint.
5 Bistable pick-up will open the steam supply valves and roll the aux feed pump turbines. Direct valve position indication is available in the control room (see enclosure No. 3).
Annunciation of the auto start signal vill also occur.
The consequences of automatically initiating auxiliary feed to a ruptured steam generator are still being evaluated by CE.
Until this analysis is comolete, we consider installation of an automatic feed initiation feature, which could be installed short-term, to be an unreviewed safety question.
Our design, therefore, vill provide automatic start of the pumps and immediate availability of feed; actual evaluation of steam generator condition and subsequent opening of auxiliary feed valve (s) must be done by the operator. This is justified by the following facts:
(1)
There is a trained operator whose sole dedicated function following a reactor trip is to operate the auxiliary feed system; (2) there is complete control of the auxiliary feed valves from the main control board; (3) there is approximately fifteen minutes available following a trip before auxiliary feed is required.
Because of schedule requirements, we vould appreciate any comments as soon as possible, and will be happy to answer any questions as they arise.
Very truly yours, L
d, A. E, Lundvall, Jr.
cc:
J. A. Biddison, Esquire G. F. Trowbridge, Esquire Mr. E. L. Conner, Jr. - NRC 1321 245
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