ML20113C290

Forwards Rev 2 to Response to Issue 19, Water in Basemat Instrumentation Conduit. Final Rept on 23 Issues Will Be Submitted by End of Jan 1985

ML20113C290
Person / Time
Site:	Waterford
Issue date:	01/15/1985
From:	Cain J LOUISIANA POWER & LIGHT CO.
To:	Eisenhut D Office of Nuclear Reactor Regulation
References
W3B85-0005, W3B85-5, NUDOCS 8501220278
Download: ML20113C290 (21)

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. eme.,ee mm. UTIUTIES SYSTEM January 15, 1985 $f[-[ W3B85-0005 A4.05 Director of Nuclear Reactor Regulation ATTN: Mr. Darrell G. Eisenhut, Director Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555

SUBJECT:

Waterford 3 SES Partial Response to Items f rom Waterford Review Team

REFERENCE:

1) Letter, D.G. Eisenhut to J. M. Ca in, dated June 13, 1984

Dear Mr. Eisenhut:

The purpose of this letter is to submit a revised response to Issue 19. This revision is for the purpose of clarifying information regarding the piezometer conduit discussed in the response. To facilitate your review, change bars have been provided in the right hand margins of the revised response to indicate the portions which have been revised. The revision to the response has been reviewed and verified by LP6L QA in accordance with Procedure QASP 19-13. Because of the minor nature of the revision, the designated subcommittee of the Waterford Safety Review Com-mittee has not been requested to review the revised response. We currently anticipate the submittal of a final report on the 23 issues by the end of January, 1985. 1 cereJ,y, 8501220278 850115 / PDR ADOCK 05000302 / ) j P PDR m' pk ') J.M. Ca in JMC:DED:pbs [ g g Attachments cc (See next page)

Mr. Darrell G. Eisenhut. Director Page 2 W3B85-0005 January-15, 1985 cc: Mr. R.S. Leddick Mr. J. Harrison Waterford 3 QA Team Leader Mr.-D.E. Dobson Region III 700 Roosevelt Rd. Mr. R.F. Burski Clen Ellyn, IL 60137 Mr. K.W. Cook Mr. J.E. Gagliardo Director of Waterford 3 Task Mr. T.F. Cerrets Force Region IV Fr. A.1. Lockhart 611 Ryan Plaza Drive Suite 1000 Arlington, TX 76011 .Mr. R.P. Barkhurst Mr. D. Couchman Mr. L. Constable NUS Corporation USNRC - Waterford 3 910 Clopper Rd. Caithersburg, MD 20878 Mr. R.D. Martin U.S. Nuclear Regulatory Commission Mr. R.L. Ferguson Region IV UNC Nuclear Industries 611 Ryan Plaza Drive, Suite 1000 1200 Jadwin, Suite 425 Arlington, TX 76011 Richland, WA 99352 Mr. D. Crutchfield .Mr. L.L. Humphreys .U.S. Nuclear Regulatory Commission UNC Nuclear Industries Washington, D.C. 20555 1200'Jadwin,-Suite 425 Richland, WA 99352 Mr. C. Knighton, Chief Licensing Branch No. 3 .Mr. C. Charnoff Division of Licensing .Shaw, Pittman, Potts & Washington, D.C. 20555 Trowbridge 1800 M. St. N.W. Mr. M. Pertnich Washington, D.C. 20555 Waterford 3 Investigation and Evaluation Inquiry Report Team Dr. J. Hendrie Leader-50 Be11 port Lane 4340 E.W. Hwy. MS-EWS-358 Be11 port, NY 11713 Bethesda, MD 20114' Mr. R. Douglass Mr. D. Thatcher-Baltimore Gas & Electric Waterford 3 Instrumentation & Control 8013 Ft. Smallwood Road Leader Baltimore, MD 21226 7920 Norfolk Ave. MS-216 Bethesda, MD 20114 Mr. M.K. Yates, Project Manager Ebasco Services, Inc. Mr. L. Shao Two World Trade Center, 80th Waterford 3 Civil / Structure Team New York, NY 10048 Leader 5650 Nicholson Ln. Mr. R. Christesen, President Rockville, MD Tbasco Services, Inc. Two World Trade Center New York, NY 10048 C

9

RESPONSE

ITEM NO.: 19 (Revision 2) TITLE: Water in Basemat Instrumentation Conduit NRC DESCRIPTION OF CONCERN: In examinir.g the safety significance of the allegations, the NRC staff performed system walkdowns as a means of verifying the as-built conditions. During one of those walkdowns, the staff noted that there was water in an electrical conduit that penetrated the basemat. If the seals in that conduit should fail there is a potential direct path for ground water to flood the auxiliary building basement. LP&L should review all conduit that penetrates the basemat and terminates above the top of the basemat to assure that these potential direct access paths of water are properly sealed. DISCUSSION: During the construction period, several permanent conduits embedded in the basemat were observed to seep water at the stub-up couplings. None of them leaked in a quantity sufficient to cause flooding concerns during construction. Silicone foam seals were placed in these conduits beginning in late 1983. In May, 1984, a walkdown, as described in Attachment 1, was performed by Ebasco which identified 29 places where wetness due to seepage from conduits or conduits within 9 boxes plus one piezometer riser were found and 12 places where evidence of past leaking from conduits and piezometer risers were found. These cases will be addressed by LP&L by removing the existing seals and replacing them with a light density silicone elastomer which has the capability to stop the seepage as required. This work will be performed as a routine maintenance item aa directed by the Plant Operations Staff, since the slow seepage through the seals is a maintenance inconvenience and not a flooding hazard. This is reflected in Attachment 1. The 12 sheet table that is part of Attachment 1 is in fact 2 related listings. The first 2 sheets list 36 items (27 conduits including one piezometer riser and 9 pull boxes). These items were checked off in the listing as either having a Icak or giving evidence of once having a leak. The remaining 10 sheets detail what conduits come into each of the 9 pull boxes listed on the first 2 sheets (Items 4.5,7,9,10,23,27,28 and 32). These 10 sheets have listed on them 56 conduits (within pull boxes) which when combined with the 27 conduits (not in pull boxes) on the first 2 sheets makes a total of 83 identified conduits. (Note: Attachment 1/ Paragraph I indicates that 8 pull boxes were identified. Subsequent to issuance of Attachment 1, additional conduits and one pull box were added to the table. The first sentence of Attachment 1/ Paragraph I requires correction. The first walkdown resulting in the memo consisted of an inventory of individual conduits which had seepage or evidence of past seepage and pull boxes containing numerous conduits which had a potential for seepage or evidence of past seepage. Subsequent to the first walkdown, the covers were removed from the pull boxes to identify individual conduits within the pull boxes with seepage or evidence of past seepage. This reduced the totals reflected in the sentence and provides the actual numbers of conduits with evidence of current or past seepage as shown in the tables.) 19-1

Temporary conduits which enter the basemat from outside, and which once allowed passage of ground water in quantities that required periodic pumping, have now all been pressure grouted as part of the normal design requirement and their temporary blockout pits filled with concrete as shown on Drawing LOU-1564-G-499 S09. Therefore, they no longer serve as leak paths for ground water. discusses the sealing of a piezometer riser and a piezometer standpipe. The piezameter riser (Item 8 of Attachment 1) consists of piezometers in a conduit down in the aquifer (surrounded by a well pipe). The conduit was internally sealed behind the piezometers and was scaled again in the portion of conduit that transverses the basemat. Since the piezometers contained in this conduit were no longer considered to be required to be operable, the conduit was capped to minimize seepage. Should it be determined later that usage of one or both of the previously operable piezometers is necessary, this conduit will be sealed with a light density silicone elastomer, as recommended in Attachment 2. The location of the riser is just south of the J wall, between SA and 6A (i.e., in corridor south of EFW pump A - see FSAR Figure 1.2-11). The piezameter standpipe is basically a well pipe filled with water under pressure from the aquifer with piezometers attached at the -35 level. This standpipe has been pressure grouted. The location of the standpipe is north of the L wall, between 6A and 7A (i.e., in the radioactive pipe chase - see FSAR Figure 1.2-19). CAUSE: Except in the case of the piezometer riser, the seal material in place does not provide total waterstop characteristics. GENERIC IMPLICATIONS: There are no generic implications since the potential paths for ground water to flow in appreciable quantities had already been addressed. SAFETY SIGNIFICANCE: There was never a path for ground water to flow in suf ficient quantity to flood the auxiliary building basement, even before the seals were installed and before the temporary conduits were grouted. The floor drain and sump pump system was more than adequate to handle the quantity of water which entered the building during construction, and is adequate to handle the much reduced quantity presently observed, most of which evaporates before ever reaching a floor drain. On this basis, there is no recognized reason that this issue should constrain fuel load or power operation. CORRECTIVE ACTION PLAN / SCHEDULE: As stated above, there is no safety significance associated with this issue. Corrective action will be taken as part of good construction practice. The decision to replace the seals on the conduits will be based strictly on operating and maintenance considerations. Any replacement seals will consist of a light density silicone elastomer which has the capability to stop the seepage. 19-2

Temporary conduits which enter the basemat from outside, and which once allowed passage of ground water in quantities that required periodic pumping, have now all been pressure grouted as part of the normal design requirement and their temporary blockout pits filled with concrete as shown on Drawing LOU-1564-C-499 S09. Therefore, they no longer serve as leak paths for ground water. discusses the sealing of a piezometer riser and a piezometer standpipe. The piezometer. riser (Item 8 of Attachment 1) consists of piezometers in a conduit down in the aquifer (surrounded by a well pipe). The conduit was internally sealed behind the piezometers and was sealed again in the portion of conduit that transverses the basemat. Since the piezameters contained in this conduit were no longer considered to be required to be operable, the conduit was cut off and capped to prevent leakage. Should it be determined later that usage of one or both of the previously operable piezometers is necessary, this conduit will be scaled with a light density silicone elastomer, as recommended in Attachment 2. The location of the riser is just south of the J wall, between 5A and 6A (i.e., in corridor south of EFW pump A - see FSAR Figure 1.2-11). The piezometer standpipe is basically a well pipe filled with water under pressure from the aquifer with piezometers attached at the -35 level. This standpipe has been pressure grouted. The location of the standpipe is north of the L wall, between 6A and 7A (i.e., in the radioactive pipe chase - see FSAR Figure 1.2-19). CAUSE: Except in the case of the piezometer riser, the seal material in place does not provide total waterstop characteristics. GENERIC IMPLICATIONS: There are no generic implications since the potential paths for ground water to flow in appreciable quantities had already been addressed. SAFETY SIGNIFICANCE: There was never a path for ground water to flow in sufficient quantity to flood the auxiliary building basement, even before the seals were installed and before the temporary conduits were grouted. The floor drain and sump pump system was more than adequate to handle the quantity of water which entered the building during construction, and is adequate to handle the much reduced quantity presently observed, most of which evaporates before ever reaching a floor drain. On this basis, there is no recognized reason that this issue should constrain fuel load or power operation. CORRECTIVE ACTION PLAN / SCHEDULE: As stated above, there is no safety significance associated with this issue. Corrective action will be taken as part of good construction practice. The decision to replace the seals on the conduits vill be based strictly on operating and maintenance considerations. Any replacement seals will consist of a light density silicone clastomer which has the capability to stop the seepage. 19-2

ATTACHMENTS: (1) Memorandum ES-9160-84 of May 18, 1984 (2) Memorandum ES-9409-84 of June 1, 1984

REFERENCES:

(1) Drawing LOU-1564-C-499 SO9 (2) FSAR Figure 1.2-11 (3) FSAR Figure 1.2-19 19-3

f 1 ATTACEMINT 1. i n. -( _ v. 0..s.2 .x U v.. P .May 18, 1984 IS-9160-81 Ic: I: ugh:aling - Nd .~.....-u_.:---__o g. - -. 1 .~. s. 5 c Subjo::: LOUISI.2_NA ?CWII & LICIT COM? ANT "w a..;. T. O .e. ?..c a a .. T.=A

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J t VAAr.x SII?ACI FR0!'. CONDUITS, ILIVAIION -35 In ce ords.nce vi:h yeu request, Civil and Elec: ical ISSI cenducted a valkdev: of :he :::dui:s which pene.::a e -he a: a: Ileva:io: -35 of the RA3, - e and Coalics :: vers to deter =ine which cc:duits are leaking va:er. A: :he sa:e ti=e NT'; vas requested :o reviev :he ype of =a:erial that ceuld be e ? oyed to seal l . :ho :: duits a:d eli iza:e sespage of va:e en.o :he floc:. E. g resul s =f :his s:ndy are as foll:vs: I L [g g ?.esul:s ef,.Valkdev: [ ~.,: = i s. A :::prehensive valkdov: ef afi ecndui:s uhich penetra:e the ?.z: a: Ilevarie: -25 revealed either seepage of vater c: evidenza :har va:er has leaked f::= 76 of :hese condui:s. The a:: ached table prevides a cc ple:e i lis:1:g of :he affe :ed :::duits i=:1uding their location a=d cab *.es . c:::aised. A large su ber of :bese conduits (53) pene :ste the F.a and j e: er fle : =cented pull b:xes. There are eight such pull be:es that ha a l .ceea s_ _. e.. _a _s a. e.s. 1 I." lesults of b'!II 5:udy NTII was requested to reviev this p::ble: and idestify the type of fix :hz: l veuld preven: v:.:e f := pene::a:ing these cendui:s. It was de:ernised ths.: sealing -he cenduits vi:h Ligh: De:si:y Sili:: e Ilas:::e: (1.3SI) vhi:h has bee: p:wided by 3&31: accc: dance vi h existing specifica:ic: 10U 1364. 24 5*=* v'_11 p reven: ':he seepage of va:e through the conduit's. 9 Assu=ing :he va:e: table to be equal to grade elevatics of +17.5 fee: and the affee ed cendui:s e.d flush vi:h slab eleva:1on -25 fee: (vers e cas e), ~~

he pressure== =cp cf :he condui: epening can be calculated as follevs:

Pressure.(?SI) = Iead (f:.)/2.31(!:/ psi) vhere ( Iead(f:.)=d{3,d,:herefere y i (.S.): ' 1 5-( 5)/2.1 or 22.. psi

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= A /. 2 i A feu: (I.) inch :hickness of LDSI has been tes:ed by 363 to be a fire ra:ed seal and a hyd:cs:a:10 seal rz:ed for 20 psl 1 I

4 J. Urugh:aling May 18, 1984 IS-9160-84 Sicco the pressure on the cendui: is 22.7 psi, 1: is rece== ended that a six (6) ~ s 1.nch :hickness of 1.DSI 1: each cendui: esd vill provide a :.zrgin for flooding at grade eleva:ien. Tae existing Silicone Foz.m fire barrie: =are:121 =us: be ce=ple:ely re=cved prio

o pouring :he LDSI.

Also, upen curi=g the LDSI bece=es hard a:d can en17 be're=oved by using a chise1. I: should be to:ed that. :he seepage of va:e onto the floor of Elevation -35 thrr, ugh these cenduits is not an i==edia:e hazard to the safery of the plan: or its personnel, but rather a nuisance to =rin:ena=ce. 0: this basis, it is

ce==e=ded tha: replacement of the Silicone f oam fire barrier =ateria.1 with the l

1.DSI be scheduled as a pos: fuel lead task a: a time ce:venie:: to I2&L. B JTG/'cr cc:

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