ML20090L729

Deficiency Rept Re Potential Seal Failures Found in Bergen-Paterson Snubbers Installed at Several Bwrs.Fittings W/Ethylene Propylene Flaps Made Available for Future Snubber Maint

ML20090L729
Person / Time
Site:	Monticello
Issue date:	10/01/1974
From:	Mayer L NORTHERN STATES POWER CO.
To:	Leary J US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 9102120576
Download: ML20090L729 (16)

Text

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• l AEC DISTRIBU.T_1.ON FO.R.PART 50 DOCKET O MATERI AL (TEMPORARY FORM)

CONTROL NO: 10226 FILE:

F ROM: Northern States Pvr. Co. DATE OF DOC DATE REC'D LTR TWX RPT OTHER Minneapalis, Minn. 55401 l Mr. L.O. Haver 10-1-74 10-3-74 X l ORIG CC OTHER SENT AEC PDR XXX TO: l J.F. O' Leary 1 nigned SENT LOCAL PDR XXX CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:

XXX 40 50-263 DESCRIPTION: ENCLOSURES:

Ltr re our 10-1-73 ltr....furn info concern llydraulic Shock Suppressor Deficiencien...

at the Monticello Nucicar faciltiy..... [CQT{l, '~

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91021205'/6 742 C01 PDR ADOCK 05000263

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S PDR PLANT NAME: Monticello l FOR ACTION /INFORMATION 10-4-74 ~'Ib BUTLER (L) SCHWENCER (LVZIEjdANN (L) REG AN (E)  !

W: Copies W/ Copies W$ Copies W/ Copies CLARK (L) STOLZ (L) DICKER (E) LE AR (L)

W/ Copies W/ Copies W/ Copies W/ Copies PARR (L) VASSALLO (L) KNIGHTON (E)

W/ Copies W/ Copies W/ Copies W/ Copies KNIEL (L) PURPLE (L) YOUNGBLOOD (E)

W/ Copies W/ Copies W/ Copies W/ Copies

~

INTERNAL DISTRIBUTION EUllL TECH REVIEW DENTON LIC ASST A/T IND

^I C . GRIMES-~ BRAITMAN ,

OGr ROOM P 506A #SCHROEDER GAMMILL #DIGGS (L) SALTZMAN )

MUNTZING/ STAFF / MACCARY KASTNER GEARIN (L) 8. HURT l CASE KNIGHT BALLARD GOULBOURNE (L)

/ GI AMBUSSO PAWLICKl SPANGLER KREUTZER (E) PLANS BOYD SHAO LEti (L) ' MCDONALD MOORE (L) (BWR) STELLO ENVIRO M AIGRET (L) CHAPMAN DEYOUNG (L) (PWR) HOUSTON MULLER REED (E) DUBE w/ input SKOVHOLT (L) NOVAK DICKER SERVICE (L) E. COUPE GOLLER (L) ROSS KNIGHTON SHEPPARD (L) ,

I P. CO L LINS IPPOLITO YOUNGBLOOD SLATER (E) D. THOMPSON (2)

DENISE TEDESCO REGAN SMITH (L) KLECKER ,

/RE_G OPR LONG PROJECT LDR TE ETS (L) EISENHUT FILE & REGION (3) LAIN AS WILLI AMS (E)

MORRIS BENAROYA~ HAR LESS__ WILSON (L)

STEELE VOLlMER EXTERNAL DISTRIBUTION LD o /1 - LOCAL PDR_4(iURCApolis, Minn.

1. 1 - TIC (ABERNATHY) (1)(2)(10) - N ATION AL LABS 1 - PDR SAN /LA/NY

/1 - NSIC (BUCHANAN) 1 - ASLBP(E/W Bldg. Rm 529) 1 - BROOKHAVEN NAT LAB 1 - ASLB 1 - W. PENNINGTON, Rm E 201 GT 1 - G. ULRIKSON, ORNL l 1 - Newton Anderson 1 - B&M SWINEBROAD, Rm E 201 GT 1 - AGMED (RUTH GUSSMAN) 1 - CONSU LTANTS Rm B 127 GT

/16 - ACRS HOLDING NEWMARK/BLUME/AGBABIAN 1 - R. D. MUELLER, Rm E 201 j'

GT

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007+ 4 {f ikll Mr. J F O' Leary, Director Directorate of Licensing

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Dear Mr. O' Leary:

MONTICELLO NUCLEAR GENERATING PIANT Docket No. 50-263 License No. DPR-22 Report of Final Resolution of Hydraulic Shock Suppressor Deficiencies I

This report is submitted in accordance with Mr. Skovholt's letter of October 1 1973,inwhichcertaindeficiencieswithHydraulicShockSuppressors(snubbersh of a type installed at our Monticello Nuclear Generating Plant were discussed. We were directed by this letter to submit at an appropriate time, within one year, our proposed program to improve snubber service life and reliability and proposed changes to our Technical Specifications describing a snubber surveillance program.

Background

on July 27, 1973 Northern States Power Company was first notified by the Directorate of Regulatory Operations that potential asal failures were found in Bergen-Paterson snubbers installed at several other Boiling Water Reactors.

Inspection of snubbers installed at Monticello on July 31, 1973 revealed several which had puf fered oil loss through failure of the polyurethane seal materials. Table 1, " Monticello Hydraulic Shock Suppressors - Summary of Inspections and Reports," is a detailed summary of the subsequent action taken to improve snubber reliability and of the inspections conducted since the problem was identified. All corrective action has been described in detail in earlier reports.

The snubbers orginally supplied to the Monticello plant were assembled with millable gum polyurethane 0-rings and molded polyurethane U-cups. Analysis of the failed seals soon af ter the problem was identifed indicated that the l

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• NOR*. 4ERN OTATKO POWER Cor..PANY 2- 1 i

polyurethane was undergoing moisture attack at the elevated temperatures experienced l in the drywell. A new seal material, ethylene propylene, was reconsnended by l l the vendor for BWR service and was subjectad to extensive qualification testing. I i Replacanent of all existing internal seals with ethylene propylene seals was

! recommended as soon as they could be made available.

j On November 7,1973 Northern States Power Company was informed by the General I i Electric Company of another potential problem with Bergen-Paterson snubbers.

I he oil-filler fitting on snubbers of the type installed at Monticello were j originally supplied with a polyurethane flap. Although no leakage from these j fittings was experienced at Monticello, at least one other BWR had experienced '

{ such failure. Immediate replacement of the oil-filler fittings with readily 1 available Buna-N flap equipped fittings was recommended. Fittings with ,

f ethylene propylene flaps were being made available for future snubber maintenance.

i i Resolution of Deficiencies l

j Until the recommended ethylene propylene seat materials were available, on hand

stocks of polyurethane seals were used to repair all snubbers found to be leaking

! oil. During a November,1973 outage sufficient quantities of ethylene propylene j seal materials were available to replace all internal seals on snubbers located

- inside the drywell. Oil-filler fittings with high temperature-high pressure i Buna-N flaps were also installed. By mid February, 1974 all snubbers located i outside the drywell were rebuilt using the reconunended ethylene propylene l internal seals and oil-filler fittings equipped with Buna-N flaps.

4 l Thirty-four additional Bergen-Paterson snubbers were installed in the drywell i during the 1974 Spring outage. All of these snubbers were equipped with ethylene propylene seals and oil-filler fittings having ethylene propylene flaps.

l .All storeroom supplies of the older seal materials and oil-fillers at Monticello l have been replaced with the recommended ethylene propylene seals and oil-filler j fittings having ethylene propylene flaps.

Table 2, " Status of Monticello Hydraulic Shock Suppressors,". lists all snubbers i installed in Safety Related Systems at Monticello and the seal materials used j in each. All snubbers have the recommended ethylene propylene internal seals.

Snubbers now equipped with oil-filler' fittings having Buna-N flaps will receive oil-filler fittingshaving ethylene propylene fleps the next time they are disassembled for maintenance. The oil-filler fittings now in use with Buna-N

! flaps have proven entirely satisfactory, however, and no failure or degradation j of those installed has been observed.

i Except in one instance, no significant oil leakage has been experienced from any snubber rebuilt according to the vendor's reconnendations using the ethylene propylene internal seals. The one instance of seal leakage was attributed to

, damage during previous snubber maintenance. Inspections have been conducted l as noted in Table 1 and results have been reported to the Directorate of Licensing l or Regulatory Operations, Region III.

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5 NOR1 HERN CTATED POWER COMPANY l ,

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! Proposed Programs of Snubber Reliability Improvement and Preventive Maintenance l

l Qualification testing by the snubber vendor and in-plant' experience to date have

{ demonstrated that replacerent of the seal material with ethylene cropylene will

prevent future serl detet oration.

In addition to the seal replacement already completed, we will implement an j extensive program of snubber preventive maintenance. At least once each l refueling cycle the following inspections and maintenance will be performed:

l l 1. We linear extension of the main cylinder piston shaft of each snubber will

] be measured and compared to accumulator level indication. Each unit will J be inspected for signs of significant external leakage. Any snubber

! showing significant oil loss will be repaired.

l 2. Approximately ten snubbers will be overhauled. All snubbers will j therefore be rebuilt over a 10-year period. All seals replaced will

! be examined for damage or abnormal degradation. If degradatie'n or ' damage is detected, the number uverhauled each year will be adjusted accordingly.

Because the solution to long term reliability of these components is a well executed program of preventive maintenance, we do not believe a Technical

{ Specification change is appropriate, i

he corrective actions we have taken and the programs we have proposed for j snubber surveillance and preventive maintenance provide a high level of assurance that these components will remain trouble free in the future. We intend to fully implement these programs commencing with our next refueling l outage. In addition, snubbers located in the drywell will be reinspected

during a short outage planned for November. We will continue to report all 4

required corrective snubber maintenance in the Monticello Semi-annual Reports.

Yours truly, l W 0-L 0 Mayer, PE l

Director of Nuclear Support Services i

i Attachments i

LOM/mM/yb cc: J G Keppler G Charnoff Minnesota Pollution Control Agency Attn. E A Prytina l

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g Table 1. Monticello Hydrsulic Shock Suppressors l

Sumary of Inspections and Reports

! Date Event Romarke l July 27, 1973 NSP notified by Directorate DRO Bulletin 73-3 l

of Regulatory Operations of i potential problems with j 'Bergen Paterson hydraulic j shock suppressors and restraints. NSP was directed to:

a) Report if the subject j snubbers are used in

safety systems at Monticello ,

4 b) Inspect each such device

! installed for proper

] fluid level I

c) Report by telephone to the 4 Region III Regulatory 1 Operations office the results of these actions i and all repairs accomplished

' or planne( and all surveil-lance scheduled for snubbers. '

I d) Confirm in writing within 10

days the report in (c) above.

l l July 30, 1974 Plant shutdown commenced for j snubber inspection -

July 31, 1973 Inspection of all snubbers Results reported by letter

completed. 37 of total of dated August 9,1973, frse l

54 anubbers were found to Mr. L J Wachter NSP, to have low oil levels. 32 of Mr. B H Grier, DRO Region III.

the units were disassembled All infonnation required by i and repaired using Buna-N DRO Bulletin 73-3 was supplied.

l and polyurethane seal mate- .

rials. Oil was added to five of the snubbers which were not rebuilt.

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. Table 8 (cont) 2 2-Date Event Rema rks l July 31,1974 (cont) All snubbers located out-side of the containment j

were placed on a weekly inspection schedule.

Snubbers located inside containment were to be inspected during the planned October 1973 l shutdown.

1 i August 17, 1973 NSP ordered by the DRO Bulletin 73-4 Directorate.of Regu-latory Operations to

, schedule reinspection of snubbers used in safety

, related systems within 45 to 90 days of the initial inspection. The results of this inspection were to be reported by telephone and in a written report within 10 days of completion. A description of modifications to assure proper operation was to be included.

September 17, 1973 Vendor identified improper seal material as source of snubber oil leakage. Ethyl-ene propylene material recom-mended for 0-rings and U-cups, i

September 28 to Reinspection of snubbers Results reported by letter October 5,1973 located inside containment dated October 9, 1973 from was completed. Of the 34 Mr. L J Wachter, NSP, to

, snubbers located in the Mr. J G Keppler, DRO Region drywell, 5 were found to have III. All information required lost a slight amount of oil, by DRO Bulletin 73-4 was but not enough to affect their supplied, perfo rmance. All other snubbers, including the 25 located outside the drywell, i experienced no oil loss, i

l The five snubbers showing slight oil loss and five others were removed and

, Tablo 1 (cont)

,  ! Date Event Rema rks 1

j rebuilt using Buna-N and ,

j polyurethane seal materials.

< Snubbers located within the j drywell were scheduled to be i inspected during the 1974 l Spring outage and during any ,

l drywell entry. Snubbers  :

1 located outside containment q were placed on a biweekly inspection schedule.

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j october 5, 1973 Vendor tests of ethylena

propylene snubber seal materials in drywell i environment completed.

Pre 10minary test data confirms initial recom-j mendation of this seal ,

material.

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] October 8, 1973 NSP ordered by letter from i Mr. D J Skovholt USAEC-DL, i dated October 1, 1973, to j replace snubber seal material

in accordsnee with vendor recommendations. Inspections at 120 day intervals if improved seal materials are i installed, or 30 day inter-l vals if they are not, were

! ordered for snubbers located

' in containment. Inspections at 30 day intervals for snubbers accessible during operation were ordered.

l Results of all inspections to be reported to the l Directorate of Licensing within 15 days of the

inspection. A final report

of the resolution of the i problem to be submitted within l one year.

j Snubber temperature and radiation environmental data was requested to i be submitted within 60 days af ter j the next shutdown.

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Table 1 (cont)'

j l Date Event Remarks l November 14 to All snubbers located Results of inspection reported l November 17, 1973 inside containment were by letter dated November 30, j inspected. All onubbers, 1973, from Mr. L 0 Mayer, NSP,

including those located to Mr. D J Skovholt, USAEC-DL.

] outside the drywell were Ihis letter included results ,

4 found operable and no oil of the snubber temperature

] loss was detected, and radiation environment i results.

! All snubbers located in the

drywell were disassembled Replacement of the oil-fill

and Tebuilt using ethylene fittings was recommended by

! propylene 0-rings and U-cups, telegram from the vendor on

! In addition, the oil-fill November 7, 1973.

I fittings were replaced with high temperature, high 1 pressstre leakproof fittings j having Buna-N sesis. No l indication of deterioration l of the previously installed l oil-fill fittings equipped

with polyurethane flaps was found.

Inapartien vi snunpers tocated outside the drywell continued i on a monthly basis based on experience to date.

! December 28, 1973 Final laboratory report on

! snubber seal material qualification testing issued l by the vendor. Ethylene

( propylene found suitable for l IMR service.

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, February 11, 1974 NSP advised by letter from j Mr. D J Skovholt, USAEC-DL,

, dated February 11, 1974, to l inspect and renew as appro-l priate all snubber oil

[ addition fittings.

l l February 17, 1974 '

.11 anubbers located inside Reported by letter dated containment were inspected. February 25, 1973, from

These snubbers continued to Mr. L 0 Mayer, NSP, to Mr.

i perform satisfactorily with D J Skovholt, USAEC-DL.

l no significant oil loss.

. Tablo 1 (cont) 5-Date Even t Remarks February 17,1974 (cont) All snubbers located out-side the drywell were disassembled and rebuilt since the last outage ueing ethylene propylene 0-rings and U-cups. Oil-fill fittings were renewed with fittings having high temp-erature, high pressure leakproof Buna-N seats.

Prior to rebuilding, slight oil loss was acted from two of the snubbers located outside containment.

March 13, 1974 & Inspection of snubbers Reported by letter dated March 16, 1974 located outside the dry- March 28, 1974, from Mr.

well was completed L 0 Mayer, NSP, to Mr. D J March 13, 1974. No oil Skovholt, USAEC-DL.

loss was found.

Inspection of snubbers located inside the dry-well was completed during an outage on March 16, 1974.

One unit was noted with oil loss and repaired. Leakage was found to be due to an 0-ring damaged during previous maintenance.

Inspection of snubbers located outside the drywell to be continued on a semi-annual i

basis based on experience to date.

March 15 to All snubbers inspected. No Annual outage inspection.

May 20, 1974 evidence of oil leakage noted.

4 An additional 34 anubbers Described in detail in a were installed in the dry- report entitled, " Permanent

! well during the outage as Plant Changes to Accomodate part of modifications to Equilibrium Core Scram the over-pressuxt relief Reactivity Characteristics,"

system. submitted by Mr. L 0 Mayer, NSP, to USAEC-DL on January 23, 1974.

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Table 1 (c:nt)' i

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l Date Event Remarks l

I J

I l March 15 to of the new snubbers installed,

! May 20,1974 (cont) 411 seals, including the oil-

! fill fitting flaps, were constructed of ethylene .

propylene.

i Two drywell snubbers were

) rebuilt during the outage.

j All seals, including the oil- +

fill fitting flaps, were

! constructed of ethylene

) propylene.

t .

i All seal materials in

] storage were purged of j polyurethane and Buna-N j

1 materials. Only ethylene propylene materials were e

retained for use in future j maintenance.

June 7, 1974 All snubbers inside contain- Reported in a letter dated

! ment were inspected, with June 17, 1974, from Mr. L 0 I

' the exception of seven ex- Mayer, NSP, to Mr. D J Skovholt, cluded due'to accessibility USAEC-DL.

l problems. No oil leakage -

or other indication of

deterioration was noted.

! September 27, 1974 Vendor recommendations l received for program of i snubber surveillance and I planned maintenance, i

October 1, 1974 Submittal to the Directorate of Licensing of proposed program to improve snubber service life avi reliability and proposed snubber i surveillance program.

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4 l Table 2. Status of Monticello Hydraulic ,

j Shock guppressors 1

1 Snubber

! 0-ring and Oil-Filler j Identification Location U-cup Haterial Seal Material Remarks l

l SS-1 Drywell-Main Steam 953' AZ 279 0 EP DN  ;

l SS-2 Drywell-Main Steam 953' AZ 81 0 EP BN

SS-3 Drywell-Main Steam 950' A 212 6 EP BN s

SS-4 Drywell-Main Steam 950' AZ 148 EP BN I

j SS-7 Drywell-Main Steam 953' AZ 240 0 EP EP i r SS-8 Drywell-Main Steam 953' AZ 1200 EP EN i

I l SS-11 Drywell-Feedwater 952' AZ 3020 EP BN l SS-12 Drywell-Feedwater 952' AZ 580 EP EN i

l SS-13 Drywell-Feedwater 952' AZ 2580 EP BN i

i i

( SS-14 Drywell-Feedwater 952' AZ 960 EP BN l

SS-17A Drywell-RHR 964' AZ 720 EP BN  ;

i SS-17B Drywell-RH1 964' AZ 720 EP BN t

i SS-18A Drywell-RHR 964' AZ 2880 EP BN SS-18B Drywell-RRR 964' AZ 2880 EP BN l SS-19 Drywell-RHR 964' AZ 3410 EP BN i

i L .- . - .. . - _ - - _ _ , _..__._ _ ._...._._ . . . . . _ _ _.. _ _ .,_ _ .__ _ .

Toble 2 (cent) .

• Snubber 0-ring and Oil-Filler Identification Location U-cup Material Seal Material Remarks SS-20 Drywell-RHR 964' AZ 19 0 EP BN SS-1AR Drywell-Recire 922' AZ 315 EP BN SS-1BR Drywell-Recire 922' AZ 135 0 EP BN SS-2AR Drywell-Recirc 927' AZ 302 0 EP BN SS-2BR Drywell-Rectre 927' AZ 122 0 EP BN SS-3AR Drywell-Recire 927' AZ 328 0 EP BN SS-3BR Drywell-Recire 927' AZ 148 0 EP BN SS-4AR Drywell-Recire 934' AZ 3020 EP BN SS-4AR Drywell-Recire 934' AZ 323 EP BN SS-4BR Drywell-Recire 934' AZ 1200 EP BN SS-4BR Drywell-Recire 934" AZ 149 0 EP BN

) SS-5AR Drywell-Recirc 941' AZ 315 EP BN SS-5BR Drywell-Recire 941' AZ 1350 EP BN SS-6AR Drywell-Recirc 953' AZ 2610 EP BN SS-6BR 0:yvell-Recirc'953' AZ 99 0 EP BN SS-7AR Drywell-Recire 953' AZ 323 EP BN i

SS-7BR irywell-Recire 953' AZ 32 EP BN SS-8AR Drywell-Rectre 927' AZ 270 EP EP i

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Tcble 2 (s.n.t) 1 - 3-1 Snubber 0-ring and Oil-Filler j Identification Location U-cup Material Seal Material Remarks

(

1 l SS-8BR Drywell-Rect re '127' AZ 90 0 EP BN l J

PSI-H2 Drywell-Main Steam 953' AZ 71 EP Note 4 1

a 1 PSI-H3 Drywell-Main Steam 950' AZ 148 EP EP Note 4 1 -

PS2-H2 Drywell-Main Steam 950' AZ 120 EP EP Note 4 i

i l PS3-H2 Drywell-Main Steam 950' AZ 240 0 EP EP Note 4 f

j PS4-H3 Drywell-Main Steam 950' AZ 212 0 EP EP Note 4 i

1 RV24-H3 Drywell-Safety Relief 950' EP EP Note 4 '

i AZ 110 i

1 RV24-H4 Drywell-Safety Relief 935' EP EP Note 4 0

AZ 100 4

RV24-H4A Drywell-Safety Relief 935' EP EP 1 te 4

! AZ 100 Drywell-Safety Relief 935' Note 4 RV24A-H5 EP EP j AZ 110 0 1

) RV24A-H4A Drywegl-Safety Relief 947' EP EP Note 4 l AZ 48 3

RV24A-H7 Drywell-Safety Relief 935' EP EP Note 4 j AZ 1150 i

! RV24A-H8 Drywell-Safety Relief 939' EP EP Note 4 AZ 32 0 I Rv25-H1 Drywell-Safety Relief 935' EP EP Note 4 AZ 1800 I RV25-H1A Drywell-Safety Relief 953' EP EP Note 4 AZ 180 0 i

RV25-H2 Drywell-Safety Relief 948' EP EP Note 4 AZ 190 RV25-H2A Drywell-Safety Relief 948' EP EP No te 4 i AZ 1900 1

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Tcblo 2 (cont)

Snubber 0-ring and Oil-Filler l Identification Location U-cup Material Seal Material Remarks l

Rv25-H3 Drywell-Safety Relief 934' EP EP Note 4 AZ 180 0 1

RV25A-H2 Drywell-Safety Relief 945' EP EP Note 4 1 AZ 120" l Rv25A-H2A Drywell-Safety Relief 945' EP EP Note 4 AZ 120*

i' RV25A-H7 Drywell-Safety Relief 953' EP EP Note 4 AZ 135 RV26-H1 Dryvell-Safety Relief 953' EP EP Note 4 AZ 2000 RV26-H1A Drywell-Safety Relief 953' EP EP Note 4

, AZ 200 0 RV26-H2 Drywell-Safety Relief 947' EP EP Note 4 AZ 200 RV26-H2A Drywell-Safety Relief 947' EP EP Note 4 AZ 2000 RV26A-H2 Drywell-Safety Relief 940' EP EP Note 4 AZ 250 RV26A-H2A Drywell-Safety Reitef 935' EP EP Note 4 AZ 250 RV27-H1 Drywell-Safety Relief 950' EP EP Note 4

]

AZ 320 RV27-H1A Drywell-Safety Relief 950' EP EP Note 4 AZ 230 RV27-H5 Drywell-Safety Relief 945' EP EP Note 4 AZ 270 RV26-H6 Drywell-Safety Relief 945' EP EP Note 4 AZ 2700 RV27-H7 Drywell-Safety Relief 945' EP EP Note 4 AZ 270 RV27A-H2A Drywell-Safety Relief 953' EP EP Note 4 AZ 2900 l

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4 Tablo 2 (cont) 5-Snubber 0-ring and Oil-Filler

_Iden t i fica t ion location U-cup Material Seal Material Remarks RV27A-H3 Drywell-Safety Relief 953' EP EP Note 4

. AZ 2900 i t

i RV27A-H9 Drywell-Safety Relief 938' EP EP Note 4 i AZ 290 0 SS-21 Torus Floor Level-RHR, South Wall EP BN SS-22 Torus Floor Level-RHR, South Wall EP BN l l

)

SS-23 "B" RHR Room-RHR, Floor Level EP BN

't SS-24 "A" RHR Room-RHR, Floor Leval EP BN SS-25 RHR Discharge-Southeast Wall EP BN Just Below Torus Cat;alk i

SS-26 "B" RHR Room-Core Spray, EP BN Floor Level s

SS-27 "B" RER Room-Core Spray, EP BN Floor Level

. SS-28A "A" RHR Room-Core Spray, EP BN Floor Level SS-28B "A" RHR Room-Core Spray, EP BN Floor Level 1

SS-29 overhead 954' Elevation by EP BN

. N2 Analyzer - RHR SS-30 overhead 954' Elevation by EP BN N2 Analyzer - RHR SS-31 Torus Catwalk - RHR Discharge EP BN t

SS-32A "A" RHR Room - RHR, 916' EP BN Behind Heat Exch.

SS-32B "A" F3HL Room - RER, 916' EP BN Behind Heat Exch.

SS-33 Above Torus on Side Sloping EP BN Towards RHR Disch.

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- Tcblo 2 (cont) 6- l i

Snubber 0-ring and Oil-Filler Iden ti fica tion Location U-cup Material Seal Material Remarks SS-34 Above Torus On Side Sloping EP BN Towards Drywell-RHR Disch.

SS-35 HPCI Room, 912' on North Wall EP BN HPCI Pump Disch.

SS-36A HPCI Room, Floor level - EP BN Turbine Exhaust SS-36B HPCI Room, Floor Level - EP BN Turbine Exhaust SS-37 HPCI Room, 905' on West Wall - EP BN Turbine Exch.

SS-38A RCIC Room, West Wall 906' - EP BN Turbine Exhaupt SS-38B RCIC Room, West Wall 906' - EP BN Turbine Exhaust SS-40 Main Steam Chase - HPCI Steam EP BN Supply SS-41 Above Torus Catwalk 927' - EP BN Core Spray Disch.

SS-42 Above Torus Ring Header NW EP BN Wall 906' - HPCI Steam Exhaust SS-43 Off Cas 917' Southeast Condenser EP EP Note 5 Area SS-44 Off Cas 91- Southeast Condenser EP EP Note 5 Area i

SS-9 Feedwater 927' RFP Area EP EP Note 5 SS-9A Feedwater 924' East Condenser EP EP Note 5 Area SS-9B Feedwater 924' East Condenser EP EP Note 5 Area l SHP-101-SS1 off Cas 945' West Turbine EP EP Note 5

Mezzanine Area i

A* Table 2 (cont) i*

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Notes: I i

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-f

1. Ar.imuth is clockwise from the airlock as zero reference.

2. The main steam lines and their associated S/R discharge lines are as below:

. A - 24 & 24A B - 25 & 25A C - 26 & 26A D - 27 & 27A d

3. Seal material codes:

BN - Buna N, high temperature - high pressure EP - Ethylene propylene

4. Snubber installed during 1974 refueling outage as part of modifications to the over-pressure relief system.

5. Snubber installed on non-safety related system.

d