ML19332F359

Forwards Supplemental Response to Insp Repts 50-413/89-33 & 50-414/89-33 Re Type C Valves,Per H Whitener Request

ML19332F359
Person / Time
Site:	Catawba
Issue date:	12/07/1989
From:	Tucker H DUKE POWER CO.
To:	Ebneter S NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8912140316
Download: ML19332F359 (3)

Text

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Duke Ibuet Company . Hu 8 h6n

,Vice President '

. P.0 Box 33198 Charlotte, NC 28242 Nuclear Production -

(70 # 173 4531

' DUKE POWER December 7, 1989 Mr. S. D..Ebneter ~

,Regtonal Administrator-

' Region II-101 Marietta Street, NW, Suite 2900 1 Atlanta, Georgia '30323

Subject:

Catawba Nuclear Station Docket Nos. 50-413 and 50-414 NRC Inspection Report Nos. 50-413, 414/89-33 Submittal of Supplemental Information Gentlemen:

Enclosed is supplemental information concerning-Type C valves, requested by-Mr. Herb Whitener during.his recent inspection at Catawba Nuclear Station.

.Very_truly yours, k

r st/Y.c s  %

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Hal B.-Tucker WRC74/lcs xc: Mr. W. T. Orders NRC Resident Inspector Catawba Nuclear Station l-l l

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8912140316 891207 PDR- ADOCK 05000413 i

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TYPE C VALVES TESTED IN REVIISE-ACCIDENT DIRECTI(El AT CATAWai NOTEt Valves listed below are common to both units. VP valves are not included.

VALVE # (PENET.#) VALVE SIZE & TYPE DISCUSSION FWil (M358) 4" Plug Valve loc. Valve is not direction-dependent, inside containment per manufacturer's drawing.

Testing in reverse-accident direction is equivalent to testing in accident direction.

NM69 (M236) 0.75" Relief Valve Valve relieves to containment.;

loc. inside cont. Testing in reverse-accident direction tends to unseat valve, ,

and is more conservative than '

testing in accident direction.

. NV14 (M347) 3" Relief Valve Valve relieves to containment.

loc inside cont. Testing in reverse-accident direction tends to unseat valve, and is more conservative than testing in accident direction.

VQ16A (M?04) 4" Diaphragm Valve Valve is not direction-dependent, loc. inside cont. per manufacturer's drawing, t Testing in reverse-accident direction is equivalent to testing in accident direction.

.: WE22 (M356) 1" Globe Valve Testing in reverse-accident loc. inside cont. direction applies pressure under seat of valve (tending to force disc open), and is more conservative than testing in accident direction.

MIMV6480 (CNIP-MIS) 0.5" Globe Valves These manual instrument valves are MIMV6481 (packless) on the ILRT pressure-sensing lines, MIMV6490 (CNIP-MI6) and are kept locked-closed except MINV6491 during ILRT. Although testing in MINV6470 (CNIP-MI7) reverse-accident direction applies MINV6471 pressure to the top of the valve seat (vs. the bottom, as with WE22), the flow area through the valve seat is so small (less than 0.2 sq.in.), that the net force on the valve plug from test pressure l (Pa = 14.68 psig) is negligible 1 (0.02 pounds force). Therefore, )

testing in reverse-accident  ;

direction is equivalent to testing l in accident direction. i l

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3 'en L. -

~ VALVE # (PENET.#) VALVE SIZE & TYPE DISCUSSION MISV5230'(CNIP-EMF-IN) 0.5" Solenoid These instrument valves are

-MISV5231 Valves ~ essentially packless globe valves. <

MISV5232 (CNIP-EHF-0UT).

The two EMF inlet valves test MISYS233 pressure is applied under the seat,

!- but the two EMF outlet valves test pressure is applied to the top of the valve seat. However, as in the case of the MIMV's listed above,- '

the flow area through the valve seat is so small that: testing these ,

valves in either direction is- '

equivalent. This is supported by the fact that past test-results for these four valves have been similar, regardless of which valves ,

are tested with pressure'under the -

valve seat.

IASV5080.(Upper PAL) 0.5" Solenoid These instrument valves are on'the IASV5160 (Lower. PAL) . Valves instrument air supply lines to the upper / lower personnel airlock outer  !

door seals. Although the valves (which again are essentially packless globe valves) are tested with pressure applied to the top of the valve seat, the seat area is once again so small that test results-at'a test pressure of 14.68 ,

psig are the same in either direction.

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