ML20003B796

Final Deficiency Rept Re Removal of Cable Insulation, Initially Reported 800403.Caused by Rodents.Damaged Cable Replaced & Maint Insp Program Expanded to Include Visual Insp for Rodent Infestation.Rodent Control Subcontracted

ML20003B796
Person / Time
Site:	Grand Gulf
Issue date:	12/18/1980
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, AECM-80-313, NUDOCS 8102250558
Download: ML20003B796 (3)

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Tc- OM- -o r MISSISSIPPI POWER & LIGHT COMPANY

] Helping Build Mississippi P. O. 8 0 X 16 4 0. J A C K S O N, M.l SsS j S S I P P I 3S205 EnkhihhmanE

.;; . c-g JAMES P. McGAUGHY. A December 18, 1980 AE$i3 TANT VtC3 PaESCENT 4

Office of Inspection & Enforcement g /hV U. S. Nuclear Regulatory Co= mission IQ Region II 3 QY 101 Marietta Street, NW U 2 3 ydi A[C Suite 3100 Atlanta, Georgia 30303 ' < " gIss%*ece,

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Attention: Mr. J. P. O'Reilly, Director -'} p8 N lim

Dear Mr. O'Reilly:

SUBJECI: Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-80/13, Final Report, Rodent Damage to Cable Insulation AECM-80/313 Re4rences: 1) AECM-80/169, 7/29/80

2) AECM-80/91, 5/1/80

3) AECM-80/256, 10/16/80 On April 3, 1980, Mississippi Power & Light Company notified Mr. F. Cantrell of your office of Potentially Reportable Defi-ciency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction l

site. The deficiency concerns rodent damage to cable insulation.

l The cables involved are associated with the Residual Heat. Removal l (RHR) System.

As previously reported, this deficiency has been determined to be reportable under 10CFR50.55(e). This condition is not reportable under 10CFR21 because the system has not been offered for acceptance. Our final report on this matter is attached.

Yours truly 9:#J.P.McGaughy,Jr. $

EWC:lb Attachment gg g cc: Mr. N. L. Stampley Mr. Victor Stello, Director I Mr. R. B. McGehee Division of Inspection & Enforcement Mr. T. B. Conner U. S. Nuclear Regulatory Commission Washington, D. C. 20555 8102250157 s *ncud'EW

• - Attachment to AECM-80/313

. Page 1 of 2 FINAL REPORT ON PRD-80/13 I. Description of the Deficiency This deficiency concerns the re= oval of cable insulotion by rodents.

The leads in question are associated with components in the Residual Heat Removal (RHR) System, na=ely RER Loop 3 Jockey Pu=p, QlE12C003E-3, and RER Loop B test-return valve, QlE12F0243-3.

II. Safety Implications Our 2 valuation confir=ed that this condition is reportable under

.10CFR50.55(e). The RER Loop 3 Jockey Pump nor= ally runs continu-cusly when the system is in standby mode. If da= age to =otor leads caused the pu=p to be inoperative and this inoperation went unde-tected, system leakage could drain the water from the RER Loop 3 discharge line. Subsequent startup of the RHR pu=p with an e=pty or partially filled line could result in waterha=cer with the po-tential of significant damage to RHR system piping and/or supports.

This resulting damage could impair the system's safety function and adversely affect the safe operation of the plant. This finding renders this deficiency a reportable condition under 10CFR50.55(e).

Further= ore, we have deter =ined that a failure of the RHR Loop B test return valve due to this deficiency also would have affected safety at GGNS.

Specifically, this valve is normally closed and is opened re=ote-manually only for testing and suppression pool cooling. A failure of the valve to open in the testing = ode would not affect safety of operations. However, an undetected failure of this valve to open for post-accident suppression pool cooling could c.dversely affect safe shutdown of the plant. Additionally, failure of the valve to close during a LOCA, assuming that the valve is open for testing or suppression pool cooling purposes, could interfere with proper operation of the ECCS syste=s necessary for safe shutdown of the plant. This finding also renders this deficiency a reporta-ble condition under 10CFR50.55(e).

A similar safety analysis was performed for a deficiency we reported on the RER Loop A test return valvc, QlE12F024A-A, in our letter to you, AECM-80/245, ?RD-80/20, Final Report, Da= age to Inter =ediate Metallic Conduit, dated October 6,. 1980.

i III. Corrective Actions Action taken to correct the discrepancy ari preclude recurrence is formulated as follows:

( l. -All damaged cable has been replaced.

2. - The jobsite subcontract for rodent control has been stepped up.

n.

- The maintenance inspection program has been expanded to include

/' a visual inspection for rodent infestation. The =aintenance N inspection form has been modified to include this step. Sub- ~ ,

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- contracts have increase, d the scope of the extermination contract'

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of bait inside Unit II equipment.

o Attachment to AECM-80/313 Page 2 of 2 III. Corrective Actions (Continued)

3. The Natche warehouse rodent control program is being handled by a contractor with twice a month visitations and inspections.

It has been visually verified by the maintenance group that poison has been set out. Natcher warehouse currently has a controlled environment. In addition to this, when equipment is received onsite or in Natchez, it is inspected on a perio-die basis per a change to the 'Jork Plan / Procedure.

4. All construction equipment on-site or in a site warehouse has been inspected for rodent da= age, witt% the exception of the Constructor's startup equipment. T.nspection of this startup equipment will be finalized'by the end of 1980 and results will be documented per the nonconformance program.

5. Information Bulletin No. G-048, " Rodent Damage to Equipment",

was' issued August 18, 1980 to all' Constructor's field personnel.

Other. actions necessary to correct.the discrepant condition are de-lineated in the Constructor's Manage =ent Corrective Action Report

, (MCAR) Number 69.

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