ML19294B190

Interim Deficiency Rept Re Seismic Amplified Response Spectrum Curves in Some Pipe Stress Analyses.Forwards Summary of Completed Mods.Final Rept Will Be Provided Upon Review Completion

ML19294B190
Person / Time
Site:	North Anna
Issue date:	02/25/1980
From:	Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
References
REF-PT21-79-172-002 934B, NUDOCS 8002270507
Download: ML19294B190 (3)

Text

-

epco s

h$n,'

February 25, 1980 q Eg Sh%

r w

. _ g)"

Mr. James P. O'Reilly, Directre Sa-1 1! Mn. 0249 Office cf Ins':ccticn, Enfercar.ent PSE&C/CGC:vnl: wang r

U. 5. Nuc' ear Requistcry Ccmissien Regicn !!

nocket th.10-1??

101 Marietta Streat Suite ' ')0 At'anta, Gecrgia 2010:

Desr 'ir. O'Reilly:

Pursuant to the previsters of 10CFES.ir'ai and irrre'1 voy,ere notifiad on Noven5er P, 1979 ar.d by letters on McVember ':, 1979 (S.N.934) and Dacee er 4, 197C (S.N.934A) cencernino seismic eplifiad resoonse scactrum (ARS) curves in some pipe stress analyses.

n our Dec mb-r 4, N70 - etter we stated that this oroblem affects 18 MSK's soolicable to Nortn Anna Unit T.

That numcer 555 sir.ce been reduced to 16 ':SK's, because the two VSX's in the Main Strew Valve lfouse (MSVF0 were corrected during the review of tr'e MSVH ARS probl e report:d under TCCFR50.5S(e) On April li,1979.

We are nearing comoletion of our review af all 16 MSK's.

This review consists of rerunning the pipe stress anelvses usino the procar ARS inout (and valve wain 5ts if re<1uired by our concurrent review of I.E. Bullatin 71-la) and analyzinn the affect of new lo Ms darivad face the oioa strass reanalyses on

1) pioe supports, 7) equioment, 3) ecuipment sucoorts, 4) contiicment penatrations, and 4 pipe ruptura analyses. Our tirgat date for finalizing our reviaw is February '9.1980.

Tele 1 I tt3chedi sumeri7es t5e modifications requirad by our raviaw to i

date. All itsted mcdifications have seen completed in the fielt.

Wa consider tSis to da an intealm raonrt oending comoletion nf nur revim.

Should you *eruire fortaer information, plessa cnntact this office.

Very truly yours, S w C. Brown, Jr.

b Senior Vic= Drasident - Pow r Ststion

\\

e Enr}ineering and Construction 6

\\

s Enclosu*e cc: Mr. Victor Stallo, Director Office of Insoection & Enf arcement 8002270

~~~)

Mr. Harold R. Denton, Director v

(

Office of Nuclear Reactor Regulation

Page 2 of 2 PSE&C 2-22-80 Serial No. 934B

/

TABLE 1 MSK No.

LINE CURVE PIPE STRESS MODIFICATIONS 11715 FUNCTION EQUIPMENT LOCATION PROBLEM RESULTS REQu1 RED ll8H CC Supply to NO EQUIPT.

Aux. Bldg Outdated Satisfactory None Recirc Air Coils ll8J CC from Pumps 2-CC-P-1A&lB Aux. Bldg Outdated Satisfactory None to HX (CC) 2-CC-E-1A&lB ll8K CC from HX to 2-CC-E-1A Aux. Bldg Outdated Satisfactory None Fuel pool &

2-CC-E-1B Unit 2 RHR il8N CC to Pump 2-CC-P-1A Aux. Bldg Outdated Overstressed/

Add I support to relieve pipe Suction 2-CC-P-1B Satisfactory overstress, with modifi-cation ll8P CC to Seal of 2-CH-E-1 Aux Bldg Outdated Satisfactory None Non. Regenera-2-CH-E-2 tive HX ll8Q CC from Seal of 2-CH-E- 1 Aux. Bldg Outdated Satisfactory None Non-Regenerative 2-CH-E-2 HX ll8Z CC Pressure N0 EQUIPT.

Aux. Bldg Outdated Satisfactory Add 1 E/W restraint for flow Control By-Pass vibration. Mod not required by ARS problen.

121J Suction Lines to 2-CV-EJ-l Aux. Bldg Outdated Satisfactory None Containment Ejectors (Hoggers)

• This modification was completed in conjunction with the Unit 1 effort, as it affected Unit 1 integrity.

L/2304/4

Page 2 of 2 PSE&C 2-22-80 Serial No. 9348 i

TABLE 1 MSK No.

LINE CURVE PIPE STRESS MODIFICATIONS 11715 FUNCTION EQUIPMENT LOCATION PROBLEM RESULTS REQUIRE 0 ll8H CC Supply to NO EQUIPT.

Aux. Bldg Outdated Satisfactory None Recirc Air Coils 118J CC From Pumps 2-CC-P-1A&lB Aux. Bldg Outdated Satisfactory None to HX (CC) 2-CC-E-1A&lB 118K CC from HX to 2-CC-E-1A Aux. Bldg Outdated Satisfactory None Fuel pool &

2-CC-E-1B Unit 2 RHR ll8N CC to Pump 2-CC-P-1A Aux. Bldg Outdated Overstressed/

Add 1 support to relieve pipe Suction 2-CC-P-18 Satisfactory overstress.

with modifi-cation ll8P CC to Seal of 2-CH-E-1 Aux Bldg Outdated Satisfactory None Non. Regenera-2-CH-E-2 tive HX ll8Q CC from Seal of 2-CH-E- 1 Aux. Bldg Outdated Satisfactory None Non-Regenerative 2-CH-E-2 HX ll8Z CC Pressure NO EQUIPT.

Aux. Bldg Outdated Satisfactory Add 1 E/W restraint for flow Control By-Pass vibration. Mod not required by ARS problem.

121J Suction Lines to 2-CV-EJ-l Aux. Bldg Outdated Satisfactory Hone Containment Ejectors (Hoggers)

• This modification was completed in conjunction with the Unit 1 effort, as it affected Unit 1 integrity.

L/2304/4