LR-N15-0053, License Renewal Commitment Implementation

License Renewal Commitment Implementation

ML15069A110
Person / Time
Site:	Salem
Issue date:	03/04/2015
From:	Jamila Perry Public Service Enterprise Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
FOL 2.C.21, LR-N15-0053
Download: ML15069A110 (6)

Text

PSEG Nuclear LLC P.O. Box 236, Hancocks Bridge;; NJ 08038-0236 MAR 0 4 2015 LR-N15-0053 FOL 2. C. 21 u.-s. tuclear Reguiatory Commission ATTN: Document Control Desk Salem Generatina Station. Unit 1 ,

Rene\tved Facility Operating License No. DRP-70 NRG Docket No. 50-272 .

Subject:

License Renewal Commitment Implementation in accordance vvith the renevved facility operating license condition 2.C.21, "DC:Ct:!

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t. '"all itf, by the end of 2013, and one core sample in the east wallwhere there have been indications of borated water ingress thmugh the concrete, by the end of 2015. The core samples (east and west walls) will expose the rebar, which wiil be examined for signs of corrosion. Any sample showing signs of concrete degradation and/or rebar corrosion will be entered into the licensee's corrective action program for further evaluation. PSEG Nuclear LLC shall submit a report in accordance with 10 CFR 50A no tater than three mn,...

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,.., 'l.d ..UlilUU.a ...., l planned actions; J1 The attached document contains the summary of the results, recommendations, and any additional planned actions for the second of the tvvo required core san1pies as stated in the license condition 2.C.21.

There are no new commitments in this letter.

S;n I! * *"e'"e1" v l 1y, f:1p Salem Site Vice President Attachments ( 1)

DocLnuent Control Desk PQn?

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LR-N 15-0053 D. Dnrrrian Admini;;tratnr

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LR-N15-0053 Attachment 1 Findings of Salem Generating Station Unit 1 Core Bore of Spent Fuel Pool East Wall

rage 1 LR-t15=0053 Findings of Salem Generating Station Unit 1 Core Bore of Spent Fuel Poot East

\.fi.i-iii Yifd.H On December 8, 2014., the Sal*em Generating Station {Salem-) rernoved a 5-in long by 4-License Condition addition, rebar

\A/as exposed to check for corrosion. The specific,License Condition is repeated beio\N for reference.

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through th concrete; by the end of 2015= The core san-1p!es (east n"""- w;;i%ffe';;. ... .:' ...... !l#<o\ -:..:.; .... ;sl --U'o;;%- .g.h#!i. ...... b#i;; r ;.4L..;_.,.,,.,h " .::. llat k;.,,. '*,...,. m=n-sJ IY W§L i!L f;AiJ- " 1- 'writ\:?_ wu M A!'LH-Y !Y!!

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-- J sigf1s of corrosion.. Any sample showing sigt1s of concrete degradation and/or rebar corrosion wiii- be entered- into the licensee's corrective action program for furuer evaluation PSEG tuciear LLC shall submit a report in accordance with 10 CFR 50:4 no later than three months a!ier each sampe is taken on the results, recon1n1endations; and any additional planned actions ..

The foilovving findings are related to the second core sample taken frorn the East \l\/all prior to the end of 2015.

Concrete Gore Exan1irtation inforrnationj dated October 25, 201 D related to Structures fv1onitoring associated vvith the Salei11 f\i*Liclear Generating Station; Units 1 and 2 License Rene¥val Application1 dated Decen1iJer 14, 2010 (ADAfv1S i\ccesson f-O fv1L103540120)1 PSEG proposed to perforrn a petrographic e:Kaminatio n of a shal!ovv core sainple approximately 4 inches deep to confirrr1 that tt1e co n cre te is in good condition.

The foHovving. discussions vvere extracted from a detailed report prepared by f\APR

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• 1 Fuei Handling Bt1ilcHt1g - Evaluation of Concrete Core and* E x posed Reinforcernent frorn East VVaU1 d ated February 27, 2015).

As per PSEG Letter No. LR-10-0414, the location of the SFP East \/Vali core Vias in the vicinity of the construction joint The core san1ple \AJas shipped to the Babcock &

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F examination of the East \tVaU core sample.

A summary of the petrography exan-iination results are provided belo\AJ.

Page2 LR-N15-0053

.. The leng th of the core sam pl e was approximately 5 inches . One end had a flat, formed surface (wa!! face on buried soii side), and the other end had a partia!iy

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caused by removal of the core sample.

" The visual examinations were performed fo!iow i n g the guidelines of ASTM C856.

" The coarse a n d fine aggregates were judged to be of very goo d quality.

.. The concrete is in good conditi o n . The cement paste did not exhibit any features that '\Nou!d indicate that it had been affected by chemical attack (i.e., softening,

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• There was a slight yellow/orange discoloration within 1 mm of the construction joint, which was attributed to carbonation of the floor slab surface during original construction. It did not appear to be a ny form of aging degradation of the concrete.

"' The core sample contained a narrow crack (Le., maximum width of 0.05 mm) that l*nU:t:tea'

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v .. -v inches toward the wall end. It passed around the coarse agg regate , indicating it likeiy occurred during the eariy life of the structure.

• Several air voids entrapped in the concrete core were filled or lined with white ernna

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- ..no d""'n-rltion vsi-..... - .. il of the concrete due to the air voids or secondary deposits. The concrete represented by th e core sections is well consolidated concrete and has a total entrapped air void content estimated at 1 to 2 percent.

Based on the resul ts of the petro graphic examination, the concrete sample did not exhibit any signs of degradation related to ingress of borated water and, therefore, no impact on the structural perforroance of the Unit 1 Fuel Handling Building due to ieakage of SFP bo rated water.

Exposed Rebar Examination In add ition to the core sample, Salem excavated a small area of the East Wall, adjacent to the concrete core sample, in the vicinity of the lateral construction joint to expose a portion of the re info rc i ng steel rebar. The excavation area was approximately 4 inches

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The excavation exposed a length of approximately 4 inches of the steel rebar. A visual examination of the expo s ed rebar was performed. it appeared to be in excellent condition with no visibie signs of corrosion of the steei rebar.

Page 3 Summarv The remova.i and exarnination of the c-0re sar1p*le i*n* the Unit 1 Spent FLJel Poot East

\tVa.U d id not shovv any indications of concrete degradation due to bo rate d \n1ater u1gress through the concrete ;.L\iso1 the exposed rebar did not shov; signs of aging=related corrosion.

There Viere no reco11n1endations or additioi1al .. r, ..; larH1ed actions resuitina fron1 the

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exan1ination. of the. secon.d SFP concrete core sai11ple The 2015 actions required the Saiem Unit 1 OperaUng License tPR-70j License Condition 2C(2 1) are cornpleted.

In conclusion, vvith ti1e subn1ittal of this letter, and our pre*vious letter, LR-N13-0263 (fo,.DAN1S J.\.ccession to. fv.1L*1.33178684)1 dated- tovetnber 12, 20131 discussirig the

\/Vest V\laU Core Sample results1 PSEG t1as fLtUy satisfied the Salen1 Unit 1 Operating Lcet1se NPR-70., License Conaiuon 2.C(21)