IR 05000312/1987004

Safety Insp Rept 50-312/87-04 on 870114-0204.No Violations or Deviations Noted.Major Areas Inspected:Operational Readiness Progress for Tdi Diesel Generators & Followup of LERs

ML20212N222
Person / Time
Site:	Rancho Seco
Issue date:	02/26/1987
From:	Richards S, Willett D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:
Shared Package
ML20212N181	List: IR 05000312/1987004 ML20212N177
References
50-312-87-04, 50-312-87-4, NUDOCS 8703120407
Download: ML20212N222 (6)

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ReportNo.'50-312/87-04[ Docket No.25'0-312 '

 .- LicenseNo.,DPR-54[' '

_ ^y Licensee: Sacramento Municipa'l Utility District

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P. O.-Box 15830 .

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  : Sacramento,. California 95813 '
 - Facility Name: Rancho ~ Seco Nuclear Generating Station  '

Inspection at: Clay Station, Cal.ifornia Inspection Conducte': d January 14 - Tebruary 4, 1987

 - Inspectors- era b d T-26~ M g ' D. J. Wille , Reactor Inspector  Date Signed Approved by:' 'esaff& Yn icha'rds hlef, E iWeering Section A ,76-87 Date Signed Sumary:

Inspection on January 14 - February 4,~1987 (Report No. 50-312/87-04) Areas -Inspected:- Routine, unannounced. safety inspection of operational readiness progress for the Transamerica DeLaval . diesel generators; follow-up of Licensee Event Reports; and review of the licensee's program for

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environmentally qualified electrical. splices. Inspection procedures TI-2500/17, 93702, and 36100 were covere Results: 0f the three areas inspected no violations or deviations were identified.

i G703120407 870226 PDR ADOCK 05000312 G PDR e

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_ T 1.' c Personnel Contacted- ,

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  *Rs Colombo,(Supirvisor Regulatory Compliance -   !

R. .DanielsJTDI Project Manager-(Bechtel) ' B.'Kumar, Environmental Qualification Engineer ~ J. Bobbit, Supervisor Engineering-J. Kaminski ,TDI' Engineering (S & W) -U A. Rush,:TDI Factory Re '

  -J. Witters.. Electrical Maintenance
  *S. Kammer. Regulatory Compliance    _;
  *F. Hauck, Regulatory Compliance    ^
  :R.- Nelson, Electrical Maintenance Foreman -   '

R.1Lucero, Electrical Maintenance Supervisor-S. Stinson, Electrical Technician

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The inspector.also held: discussions with other licensee and contract personnel during the inspection. This included plant staff engineers, technicians, administrative and clerical assistant ,

  * Denotes-those personnel attending the exit' interview on 1-16-87.-

2.- -Ra.ychem and Qualified Electrical Splices

  'The inspector interviewed personnel responsible for the implementation of the Environmental Qualification' Program'(EQ) for electrical equipment, and for supervision / installation of Raychem and other qualified electrical splices. Within the .last three or four months the. licensee has started using.0konite: tape splices. The licensee' intends to use Okonite splices on all EQ' quality class and'non class IE' splices below 600 volts. Above 600

- ' volts the licensee intends to continue to use Raychem for EQ splicing. The inspector reviewed the licensee procedure (EM.137 Rev'. 2)-for installation.

, of Okonite Tape splices. The licensee does not have a unique procedure for , installation of Raychem electrical splices but uses the vendor specific ' installation instructions for each type of splice. The licensee has trained their personnel in the' installation of Raychem and Okonite L splices.

l: The-inspector reviewed the licensee's EQ file (file f ZEQPE0630) for l Okonite T-95 splicing tape.~The EQ file used data from a Patel Engineers testreport(#PEI-TR842900-1) which was performed for Fitzpatrick Nuclear Plant using Fitzpatrick installation procedures. The'0konite :plice is only for power and control cables and not for instrumentation circuits

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  (because of leakage currents - refer to section 6.5 of equipment i   evaluation EQ' file) and'is not to be installed in the turbine building or i

reactor building below -17-6" except inside of limitorque MOV switch compartments (page 58, SMUD qualification 11-10-86). Submergence is not applicable-(note 8 of EQ file). Section 6 of the equipment evaluation, part 6.2.1, states that the tape splices will be installed per Ref. 9 L including splicing cement and that the only difference in installation is !' the use of Scotch No. 27 instead of Okonite No. 35. The inspector , i

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l # identifie'dLthe following key points in the Patel report'(reference # 2s)::

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_o 1The lu.nction' box i teitedicontained a:1/4-inch weep hole for condensate ."

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 <  .o TIhe splices were t'o bdlinkpected forL burrs arid sharp edges and filed

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or. sanded -prior to taping. .

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Lo For the~in-line and parallel splice taping 1.nstruction.the procedure

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_ said tofcoat;the entire' surface to be taped with Okonite Nuclear

   .SplicingECementiand allow to dry.-
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  -o The-0konite installation procedure ~says.to clean the wire with

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   (chlorotheneorothersuitablesolvent.

v Jo The qualification package contains the properties =of.chloroprene

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   .(0konite-35 neoprene)

! eo The Okonite installat.i ion procedure says to use Okonite No. 35 tape to

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  ,  the outside:of Okonite T-9 .The: licensee procedurel(Rev. 2) has omitted the steps to inspect for burrs
  / sharp edges and application of splicing cement (Rev 1 did'contain the

provision'to use the cement). The' licensee installation procedure says to

  : clean the wire'with ethyl alcohol instead of'clorothene and instead of   ~
  ,0konite 35, uses Scotch 27 adhesive tape. It appears that the' synergistic

effects of this' adhesive has:not been tested or addressed. The inspector

  . talked with the Okonite-Vice-President of Engineering in Ramesy, New Jersey, Mr. Jack Lasky, and his position was that Okonite procedures should be followed regarding.deburring the connection and using the cement. He
. did'say that use of ethyl alcohol insted'of chlorothene was acceptable. He

- went on to:say that the function.of the Okonite-35 (neoprene) tape was to

-   provide fire proofing as well.as physical protection. He agreed with the inspector's observation that the Okonite T-95 tape was very flammable and I
,   would support combustion on it's own. During discussions with. licensee

' personnel, the licensee ' stated that while T-95 Okonite tape would burn if a heat source was directly applied, it would not support combustion on it's'own. The licensee is~ evaluating the flammability aspects to determine if it is'~a concern.

_The licensee agreed with th'e~ inspector'that the reason for inclusion of

  : reference f 24 into the qualification package is for the use of Okonite 35 tape which has been deleted by the licensee and replaced by Scotch 27
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tape. The licensee will update the EQ file to reflect this point and also i 1 include the newest revision of the installation procedure after it has

been revised to include instructions for inspecting and correcting any

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splice burrs or sharp edges. Resolution of what to do about existing

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splices performed without details for inspection / repair of burrs and sharp edges remains open (87-04-01). Additionally, reference 9 in the EQ file,

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. which states that splicing cement is used is inconsistent with EM.137,

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Rev. 2, and therefore appears incorrect and should be corrected. The - licensee is using a Okonite qualification report NORN-3 (Ref. 5) for qualification of the tape splices pressure profile because the main i !, '

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   ? qualification test(Ref. 8) did not cover the Rancho Seco pressure profile yE,  #
   -(seelsection 6;4.3). Ref. 8 profile was 50 psig (fig 6) while the Rancho -

Seco accident profilenisl57.2_psig. Ref. 5 pressure profile is to 114 psig

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however;the tape installation : includes the 0konite cement in the ' sample-

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preparation (refer to the instructions for installation, drawing.No.:

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  . D-11489c which is included in Ref 6).- Therefore, it would' appear that use e
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of. the Okonitef cement,' per the manufacturer's recomendations and '

  ,  installation instructions, is ;necessary ~for. qualification of Okonite tape-
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splices on the basis-of current licensee qualification file-Z-EQP-E063 f- m

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This is an' unresolved item (87-04-02).

' The'inspectorwalkeddownandinspectedseveral'0konithtapesplice installations. These installations were :

   -.1.. -HV"35070 Steam Trap Isolation Valve to HP Turbine 7   2.- HV 30124 Gland Steam Spill Bypass
 , HV~33011E Inlet Valve to B-Folisher      '

4  : No discrepancies were identified during the inspection of the above tape

   . splice The inspector also inspected installation of a Raychem splice for the motor feeder to the Reactor Building "A" Spray' Pump motor P291A~. This-
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Raychem splice had been identified, in a earlier licensee inspection summary 1-15-87, as an example of incorrect Raychem kit selection, not

   . reportable, and no rework necessary. The licensee inspection was in response to-NRC IE Notice 86-53 " Improper Installation of Heat Shrinkable

. - Tubing"._The licensee did a 100% inspection of EQ splices for the 143 junction boxes and 78 motors resulting in 37 and 27-problems in these-respective areas. No problems were identified-in the 39 of 186 i , penetrations that were sampled. The instruction (# 0790-273-01) for l inspection of the Raychem installations required that a person certified L' -in Raychem installations inspect 'at least'S splices. Five of a total of 407 would seem to be a extremely small sample size. During this inspection

,   the inspector made the following observations: The conduit leading to the motor junction box (approx. 6 feet) was sealed at the end opposite the terminal box with a gray material which looked like fire-proofing and not Bisco LOCA-sea . The motor feeder junction box had a drain hole, but this hole had a l    pipe plug in it, contrary to the tested configuration (Patel report). The seal for the conduit inside of the junction box appeared to be RTV, which generally is unstable under sufficient irradiatio The motor feeder cables outer insulation was a braided fabric type of material, underneath the Raychem splice, which is not normally an acceptable configuration.

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W f"_ M; MM.' ; 1 ' There wasino: inner Raychem heat shrink tube to the Raychem cap"(outerc -

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In additionito butinot1related'to the above observations, the inspectorf yo .i . .. >

    : pointed out;a yellow ' plastic 3/8 : inch cable-pull rope:that appeared to' ,
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have-been left?in an. overhead conduit by.the cab 1( trays close:to thei , y; 'f" ' motor feeder conduit.nThese observations and potential. discrepancies-m <

   , Jidentified by the inspectortwill be_followed-up-further'during subsequent -
    . inspections.(87-04-03).

~ Q x 36 Transamerica DeLaval (TDI) Diesel Generator Progress

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 ,-   LThe licensee has completed the 100 hour run for.both-(A&B) TDI diesel After. the 100' hour run each diesel was. " torn-down"~and inspected, then
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reassembled under the direction of General Electric' service contract .

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   ' personnel. The in'spection points and results are-documented in complete _   ConstructionInspection-DataReports(CIDR's).Nomajorproblemswere
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encountered during the 100 hour runs or tear-down/ reassembly except for

   ' excessive. vibration in the diesel turbo-chargers. The turbo-chargers have
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been_sent-back tofthe factory for rework / balancing.. Temporary supports:are-

   ;being installed to alleviate the vibration, and TDI is' investigating this
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problem and designing a permanent support (other nuclear: facilities have experienced similar vibrations problems)J By February 20P 1987, the .

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_ licensee intends to issue a report covering the~ work completed in phase Construction has:" turned-over" the diesels to the startup organizationJon

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January.16, 1987. The current license e schedule for turn-over from startup

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to; operations:is May 27, 198 ' IFollow-up of! Licensee Event Report (LER)

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i TheIinspecitor reviewed LER'86-22 which details circumstances-surrounding the: incorrect removal from service of radiation monitor R-150028. The i y licensee has finished the root cause analysis but the long-term corrective < , actions have not-been finalized as~of the time of this inspectio Immediate and interim corrective action has been implemented. Special

,. Order 186-13, clarifying the clearance procedure has been issued. The.

i 1 .results of the' root cause, and corrective actions,' which will be included I ;in the supplement to this LER, will.be reviewed during a subsequent inspectio '

  ' . Unresolved-Item j   f n
 *  , Unresolv'ed items are matters about which more information is required in
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order to ascertain whether they are' acceptable items, violations, or ' ! ' deviations. Unresolved items disclosed during the inspection are discussed , in paragraph 2.

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 '6 . ~ Exit Interview-
  ;The inspector. met with licensee representatives (denoted in paragraph 1)
  -at the conclusion of the inspection on January 16, 1987 and during
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subsequent teleconferences on January 22 and February 4, 1987. The scope

and findings of the inspection,-which were discussed during the exit and

  'telecon interviews,-are set forth in paragraphs 2 through 4_of this report.-
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