ML17277B060

Advises That Triaxial Peak Accelograph Will Be Mounted on Reactor Pressure Vessel Cap Space Frame at Elevation 584 Ft. FSAR Will Be Amended to Indicate Changed Location

ML17277B060
Person / Time
Site:	Columbia
Issue date:	11/15/1983
From:	Sorensen G WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Schwencer A Office of Nuclear Reactor Regulation
References
GO2-83-1055, NUDOCS 8311220288
Download: ML17277B060 (6)

Text

REGULATORY it4"DONATION DISTRIBUTION SYSTFN (RIDS)

ACCESSION NBR o 83112?0288 0

C e DATE: 83/11/15 NOTARIZE:

NO DOCKET FACIL:50 397 HPPSS Nuclear Project~

Unit 2~ lgashington Public Powe 05000397 AUTH,NAME AUTHOR AFFILIATION SORENSEN~GiC, Washington Public Power Supply System RECIPoNANE RECIPIENT AFFILIATION SCHNENCERgA, Licensing Branch 2

SUBJECT:

Advises that triaxial peak accelograph will be mounted on reactor pressure vessel cap space frame at Elevation 584 ft ~

FSAR will be amended to indicate changed locatione DISTRIBUTION CODE B001S COPIES RECEIVED LTR ENCL SIZE ~

TITLE: Licensing Submittal:

PSAR/FSAR Amdts 8 Related Correspondence NOTES:

REC IPIENT Ib CODE/NAME NRR/OL/ADL NRR LB2 LA INTERNAL: ELD/HOS2 IE/DEPER/EPB 36 IE/DEQA/QAB 21 NRR/OE/CEB 11 NRA/DE/EQB 13 NRR/DE/NEB 18 NRR/OE/SAB P4 NRR/OHFS/HFEB40 NRR/DHFS/PSRB NRR/DSI/AF8 26 NRR/DSI/CPB 10 NRR/DSI/ICSB 16 NRA/DSI/PSB 19 NRR/DSI/RSB 23 RGN5 EXTERNAL." ACRS 41 DNB/DSS (AMDTS)

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Washington Public Power Supply System P.O. Box 968 3000 George Washington Way Richland, Washington 99352 (509) 372-5000 November.15, 1983 G02-83-1055 Docket No. 50-397 Director of Nuclear Reactor Regulation Attention:

Mr. A. Schwencer, Chief Licensing Branch No.

2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.

20555

Subject:

NUCLEAR PROJECT NO.

2 SEISMIC INSTRUMENTATION, LOCATION OF Regulatory Guide 1.12, Revision 1, paragraph C.l.a recommends that one of three triaxial peak accelerographs be provided at "a selected location on the reactor-equipment".

Presently, the WNP-2 Final Safety Analysis Report section 3.7.4.2 describes the location of the triaxial peak accelero-graph meeting this recommendation as "mounted on the reactor vessel head".

Environmental review of this location indicates that the instrument is not suited to the anticipated temperatures in that area.

As a result, the Supply System will mount the triaxial peak accelerograph on the reactor pressure vessel cap space frame at elevation 584'hich is rigidly attached to the primary containment vessel.

As discussed in Regulatory Guide 1.12, the triaxial peak accelerograph is required in order to quantify the "magnitude of the response of the systems and components supported on the containment structure".

Although not mounted on "a selected location on the reactor equipment" as recommended by the regulatory guide, the alternate location on the RPV cap space frame meets the intent of the guide.

The WNP-2 Final Safety Analysis Report will be amended as shown in the attached revised FSAR page to indicate this changed location.

Should you have any further questions, please contact Mr. P. L. Powell, Manager, WNP-2 Licensing.

Very truly yours, G.

C.

S rensen, Manager Regulatory Programs PLP/tmh Attachment cc:

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NNP-,2 to the free end of each reed inscribes its deflection on a

recor4 plate.

A calibration sheet for each recorder lists the resonant frequency and acceleration sensitivity of each reed.

Data reduction is accomplished by measuring the maxi-mum distance of the scratched record from the zero line.

One of these triaxial response-spectrum recorders is equipped with limit switches, for each reed, which are set at a specific acceleration

which, when exceeded, light an annunciator in the main control room.

This triaxial response-spectrum re-corder is located in the reactor building basement and is mounted on the foundation close to the time.-history accelera-tion sensor.

One triaxial respon..e--pectrum recorder is mounted on the llPCS injection lin>> piping support outside containment.

Another recorder is located or> the reactor building floor at elevation 606'-10-1/2" and the l~ast re-corder is located on the foundation of the radwa. tc building within the control portion.

Thre>> triaxial peak-accelerographs are provided.

These device record peak acceleration and functio'n in a simi1ar manner to the triaxial respons<'.-spectrum

'recorders.

)/owevi r,, the Lriaxial peak-accelerographs are frequency independent and record just a peak value of acce1era-tion.

One of these unit i-mounted on the Another unit is located on the ilPCS injection li.nc piping inside containment and one unit i" mounted on the standby service water piping in the standby service water pumphouse.

3.7.4.3 Control Room Operator Notification The information, wti'i.ch the sy.tom makes available to the control room operator, i.s as descr;ibed in 3.7.4.2.

The bases for establi -hing predetermined values for activat-ing the readout of the seismic instrumentation to the, control room operator are:

a.

To initiate the triaxial time-history recorders, at a very low level acceleration equal to 0.01g as recommended by ANSX 18.5, Section 6.4.2.

b.

To provide immediate control room annunciation if the operating basis earthquake has been exceeded.

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