ML19340E098
| ML19340E098 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 12/30/1980 |
| From: | Conway W VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| TASK-2.K.3.13, TASK-TM WVY-80-175, NUDOCS 8101060389 | |
| Download: ML19340E098 (2) | |
Text
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- a ENGINEERING OFFICE TURNPIK E RO AD WEST DO RO, M ASS AC H USc T T S 015 81 T F. L E P H O N E 6 5 7 306 So f t December 30, 1980 United States Nuclear Regulatory Commission
' ashington, D.C.
20555 Attention:
Darrell G.
Eisenhut, Director Division of Licensing
References:
(a)
License No. DPR-28 (Docket No. 50-271)
(b) NURFG- 0737 Itea II.K. 3.13 (c) VYNPC Letter (L i 80-170) to USNRC dated I'ecember 15, 1980 L. l!. Heider to D.G.
Eis enhu t
Subject:
Response to ';UREG-0737 lten II.K.3.13
Dear Sir:
Reference (b) requires that the initiation levels of the HPCI and RCIC systems be separated so that the RCIC system initiates at a higher water level than the HPCI system.
Reference (c) provided VYNPC's re-sponse to this requirement.
Reference (b) also requires that the initiation logic of the RCIC system be modified so that the RCIC system will restart on low water level. The results of our evaluation and proposed modifications are as follows:
Presently, the RCIC trip / throttle valve trips on high water level and must be manually reset at the turbine before RCIC will restart.
A Limitorque motor operator will be added to this valve to allow the valve to be reset automatically.
In addition, the high water level trip will be removed from the trip / throttle valve and instead close the motor operated steam to turbine valve (V13-131 ).
Closure of V13-131 will shutdown the turbine and trip the trip / throttle valve on low oil pres-A logic change will be made such that high water level trip and sure.
V13-131 closure will automatically reset the trip / throttle valve.
At this point, the RCIC system will be ready to restart on low water level.
In addition to the motor operator, a change will be made to the linkage arrangement on the trip / throttle valve to permit this valve to be reset automatically without oil pressure.
8101 060 J
V ER MO N T YAN K C E N UCLEAli POWLii COf M'OI '-sTIO N l'n i ted Sta t e<
Nuclear Regulat ory Cm nis ien De c er:be r 30, 1930 page 2 The :notor operator and linkage arrangenent are used only to reset the trip / throttle valve, and in no way etfeet the tripping characteristics of this valve.
Closure of the s t ea:, to tt.rbine valve will increase the Line prior to cessation of steam flow.
The small additional volume of water added to the reactor will be insigniticant.
The logie changes will effect only the high level shutdown 1,gic and will in no eav prevent system initiation.
Therefore it is concluded that this radifi-cation will not degrade proper system iunction.
As stated in Itef erence (c), the installation of this modification ill take place during the first scheduled outage of sufficient duration following receipt of equipment.
L'e trust that this information is satisfactory; however, should you desire additional informat ion, please centact us.
Very truly vours, VEICONT YANKEE NUCIIAR PO'.s'EP CORPORATION b'i l 1 a'n F.
Cc.aay Vice President and Manager of Operations b'FC/dm