ML20209J414

From kanterella
Jump to navigation Jump to search
Forwards Details on Relief Valve Operation at Facility in Response to Part 1 of .Relief Valves Equipped W/Separate Discharge Line to Torus Terminating in rams-head as Discussed in 730718 Telcon
ML20209J414
Person / Time
Site: Vermont Yankee, 05000000
Issue date: 01/16/1974
From: Heider L
VERMONT YANKEE NUCLEAR POWER CORP.
To: Ziemann D
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20209J032 List:
References
FOIA-87-40 565, NUDOCS 8705040281
Download: ML20209J414 (3)


Text

h Q j ', , ,

~

fj ,

VERaiONT YANKEE NUCLEAR POWER CORPORATION

-J SCVCNTY GCVEN OROVC STRCCT RUTLAND, VERMONT 05701 REPLY TO:

ENGINEERING OFFICE TURNPlKE ROAD WESTBORO, M ASS ACHUSETTS 01581 TELEPHONE 617 366.9011 January 16, 1974 Directorate of Licensing N United States Atomic Energy Commission , ,

Washington, D. C. 20545 .

Attention: Mr. Dennis L. Ziemann Chief, Operating Reactor Branch #2

Reference:

a) License No. DPR-28 (Docket No. 50-271) b) Directorate of Licensing letter dated December 19, 1973

Dear Sir:

This letter is forwarded in response to part one of reference (b) which requested details on relief valve operation at Vermont Yankee.

This information has been tabulated in Attachment A. In the future information of this nature will be incorporated into the semi-annual report.

The following information, including Attachment A, was provided to the Directorate of Regulatory Operation, Region I in a telephone conversation on July 18, 1973 (B. Riley, V.Y.P.S. to C. Plumley, DORO) and may be of some use to you in the review outlined by reference (b) .

1. Each relief valve at Vermont is equipped with a separate discharge line to the Torus terminating in a " rams-head".
2. Considering all t>Tes of stresses to which the Torus may be subjected as a result of relief valve operation at operating temperature and pressure, the Torus is designed for 187 cycles per year for 40 years.

We trust that this information is responsive to your request.

Answers to Part 2 of reference (b) will be forthcoming within the next 30 days.

Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION PDR THOMAS 07-40 Manager of Operations 6Od DWE/kg Attachment

o .. $

ATTACHMENT A TO VY LETTER DATED 1/16/74 RELIEF VALVE OPERATION AT VERNONT YANKEE TIME PERIOD NUMBER OF MEANS OF INITIATION MODE OF PLANT OPERATION CYCLES 1/7/73 - 12/31/72 ,

11 See Below See Below DETAILED BREAKDONN 9/26/72 4 Manual - each valve once Startup Test at 20% Power to test performance. Normal Temp. and Press.

11/17/72 2 Manual - 2 valves once Reactor Scrammed from 30%

to Control pressure after power after loss of Aux.

vessel isolation. Transformer during Shut-down from ou'tside control Room S.U.T.

13/12/72 2 Manual - I valve twice Reactor subcritical at 910 psi to control pressure after during scheduled shutdown vessel isolation. during which high level resulted in vessel isolation.

12/27/72 3 Automatic - 3 valves Reactor scrammed from 63%

once as a result of power as a result of L.N.P.

pressure spike. initiated by loss of start-up transformer.

1/1/73 - 6/30/73 2 Manual 100% Steady state.

DETAILED BREAKDONN 1/17/73 2 Manual - 2 valves once Reactor scrammed from 100%

to control pressure after power as a result of vessel vessel isolation. high level isolation from F.W. Transient.

1/7/73 - 12/31/73 ,,

6 Manual Scram following Transient DETAILED BREAKDONN 7/8/73 1 Manual - 1 valve once to Reactor scrammed from 73%

control pressure after power as result of MSIV vessel isoletion. isolation caused by trouble shooting for DC ground.

  1. 1 . ,.

.. 4 i

. TIME PERIOD NUMBER OF MEANS OF INITIATION MODE OF PLANT OPERATION CYCLES 7/31/73 2 Manual - 2 valves once Reactor scrammed from 72%

to control pressure after power as result of low vessel isolation. steam line pressure in Run when all bypass valves opened caused by short in E.P.R.

8/22/73 3 Manual - 3 valves once Reactor scrammed from 68%

to control pressure after power as result of MSIV vessel isolation. isolation caused by high vessel Icvel caused by erroneous level signal injected into F.W. control system.

1/1/74 - Pre ~sent None

.