ML19343B124
| ML19343B124 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 10/08/1975 |
| From: | Purple R Office of Nuclear Reactor Regulation |
| To: | Groce R YANKEE ATOMIC ELECTRIC CO. |
| References | |
| NUDOCS 8012080021 | |
| Download: ML19343B124 (3) | |
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October 8, 1975 DISTRIBUT0N Docket File OI6E (3)
Docket No. 50-29 ORB #1 Reading ACRS (16)
NRC PDR Abernathy Local PDR Yankee Atomic Electric Company KRGoller ATTN:
Mr. Robert H. Groce TJCarter Licensing Engineer RAPurple 20 Turnpike Road ABurger h*estboro, Massachusetts 01581 SMSheppard
- l SVarga Gentlemen:
OELD 7vj.
This refers to your September 8, 1972, January 20, and February 14,
~T 1975 submittals which describe the results of your evaluation of the effects of non-safety related system failures on safety related W.
equipment at Yankee-Rowc. You made these submittals in response to our requests of August 8, 1972 and December 17, 1974.
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h'e have reviewed your submittals and find that we need the additional 3
infor=ation identified in the enclosure to this letter. The specific c,..
items in the enclosure have been discussed between our staffs on T
October 6, 1975.
In order to maintain our review schedule, we need your response to il this request within 45 days from your receipt of this letter.
Q Sincerely, 75&
2 Original signed by:
j[>z Babe.t..L EurPh Robert A. Purple, Chief
,.7 Operating Reactors Branch #1 Division of Reactor Licensing
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Enclosure:
Request for Additional Information ji&
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REQUEST FOR ADDITIONAL INFORM \\ TION YANKEE NUCLEAR POWER STATION (YANKEE-R0h'E)
DOCKET NO. 50-29 1.
Your discussion of potential flooding of safety r.clated equipment that might result from a potential failure in any 'of the non-safety elated system component or pipe is limited to the areas inside the E
Tarbine Building, the Primary Auxiliary Building and the Diesel Generator Building.
Provide assurance that your investigation of other areas including the containment has shown that safety related equipment, instrumentation and cabling in those areas could not be subjected to flooding.
2.
You stated that a rupture of the circulating water system at the ground level inside the Turbine Building would not produce sufficient flooding that could adversely affect the operation or performance of safety related equipment in that area. Your conclusion considered the installed height of the motors and.:ssumed that water accumulating on the ground floor would egress through three large open overhead li' doors.
Describe the consequences of this postualted rupture assumed to occur when all overhead doors are closed, and indicate the following:
the safety related equipment in this area that might be adversely affected and the available redundant equipment in other unaffected areas that would be capable of performing the required safety functions.
Indicate also any available means for early detection of potential flooding at the floor level inside the g
Turbine Building, describe the actions that would be taken to stop the flooding and confirm that written and approved procedures exist that define the necessary operator actions for coping with this flooding event.
I 3.
Describe the available means to alert the operator of a failure in any non-safety related system component or pipe that might result in flooding of other areas inside the Turbine Building. Also, describe the actions that would be taken to stop the flooding, and confirm that written and approved procedures exist that define the necessary operator actions for coping with these flooding events.
4.
You indicate that there are ir erconnecting safety related cables between the Trubine Building and the Diesel Generator Building.
Describe the routing of these cables and provide assurance that they will not be adversely affected by any postulated flooding event inside the Turbine Building.
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To protect the Motor Control Center 4 (MCC#4) against flooding you i
have made openings at the ground floor of the Primary-Auxiliary Building (which houses MCC#4) for egress of water, and you have installed T
redundant alarms in the building floor sumps. With regard to these modifications describe the following:
the choice.of the break in the
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service water system for si::ing the openings in the north wall of the J-i building; assuming the operator does not respond to an alarm signalling
- j water loss from the service water pipe break, how fast would the water j
rise above the ground level in the Primary-Auxiliary Building (time /
elevation); what action would the operator take, in the event of an 3
alarm. Also, confirm thatwritten and approved procedures exist that
- i j define the necessary operator actions for coping with the flooding
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1 events.
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