ML20141G084

Forwards Application for Amend to License NPF-29,changing Tech Specs to Lower Requirement for Standby Gas Treatment Sys Heaters in Surveillance 4.6.6.3.d.5 Per NUREG-0588.Fee Paid

ML20141G084
Person / Time
Site:	Grand Gulf
Issue date:	02/17/1986
From:	Kingsley O MISSISSIPPI POWER & LIGHT CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML20141G088	List: AECM-86-0052, Application for Amend to License NPF-29,changing Tech Specs to Lower Requirement for Standby Gas Treatment Sys Heaters in Surveillance 4.6.6.3.d.5 to 50 Plus/Minus 5 Kw L-86-002, Forwards Application for Amend to License NPF-29,changing Tech Specs to Lower Requirement for Standby Gas Treatment Sys Heaters in Surveillance 4.6.6.3.d.5 Per NUREG-0588.Fee Paid ML20141G084 ML20141G173
References
RTR-NUREG-0588, RTR-NUREG-588 AECM-86-0052, AECM-86-52, PCOL-86-002, PCOL-86-2, TAC-60700, NUDOCS 8602260155
Download: ML20141G084 (3)

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MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 184 0, J AC K S O N, MIS SIS SlP PI 39215-1840 February 17, 1986 O. D. KINGSLE Y, J R.

WCE PRE 54 DENT NUCLEAR OPERATIONS U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, D. C. 20555 Attention: Mr. Harold R. Denton, Director

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-29 File: 0260/0840/L-860.0 Proposed Amendment to the Operating License (PCOL-86/002)

AECM-86/0052 On February 12, 1986, Mississippi Power & Light (MP&L) began procedures to place the Grand Gulf Nuclear Station (GGNS) in cold shutdown to repair a leaking recirculation pump seal. During the period that the plant was down, surveillance 4.6.6.3.d.5 was performed on the B Train of the standby gas treatment system (SBGT) heaters but they did not meet required heat dissipation values. This surveillance requirement, which was successfully performed in March 1985, requires that at least once per 18 months the standby gas treatment system heaters are verified to dissipate 50 ! 5.0 KW.

The heaters originally installed in the standby gas treatment system were 50 KW nominal as supplied by the vendor. These heaters were not qualified to the requirements of NUREG 0588. Subsequently, Design Change DCP 84/3109 was performed on the SBCT system to install new heaters which meet NUREG-0588 requirements. These new heaters are 48 KW nominal rated compared to the originally installed heaters which were rated at 50 KW nominal. Normally during development of a DCP, determination of the need for a Technical Specification change is made and processed as part of the design change. No Q Technical Specification changes were deemed necessary during the review of the y

b DCP. MP&L is reviewing this process to determine if any corrective actions rh are necessary.

SS mo While performing retest requirements for DCP 84/3109 it was noted that in:c the new heaters were marginal with respect to meeting Technical Specification 500 Surveillance Requirement 4.6.6.3.d.5 of 50 5 KW. On March 8, 1985 MNCR-0142-85 ob was written to document this concern. Calculations were done to determine the M heat dissipation requirements needed to meet design requirements for the SBGT

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h0Q system (reducing 150*F inlet air at 4000 CFM flow from 100% to 70% relative humidity). This calculation shows that approximately 21.5 KW of heat dissipation is required to reduce the air leaving the heaters to 70% relative \g Rulcl w]emue /;tsoco J12AECM86021501 - 1 Member Middle South Utilities System

I AECM-86/0052 Page 2 humidity. On March 14, 1985 a Technical Specification Change Request (the initial step in preparing a formal submittal to the NRC) to lower the 50 1 5 KW value in Surveillance 4.6.6.3.d.5 was prepared. Due to an administrative problem no action was taken on this change until February 13, 1986 when it was discovered that this was still an open issue.

Due to questions raised concerning this matter, it was decided as a matter of prudence on February 14, 1986 to rerun Surveillance 4.6.6.3.d.5 with the anticipation that the Surveillance Requirement would be satisfied, even though the surveillance was not due to be rerun for approximately seven (7) more months. The heaters in Train B of the SBGT system failed the retest on February 15, 1986 in that they tested at 44.926 KW versus the 45 KW required by the techr.ical specifications. This was a difference of approximately 74 watts.

As a result of this failure, the B Train of the standby gas treatment system was declared inoperable and entry into Operational Conditions 1, 2, 3 and

• was prohibited. The A Train test was satisfactorily completed on February 16, 1986.

On February 15, 1986 in a telephone call with Mr. Roger Walker of the NRC Region II office from Mr. O. D. Kingsley, Jr., MP&L was granted discretionary enforcement to allow for the scheduled restart of GGNS and its continued operation until a Technical Specification change could be processed. The justification for the discretionary enforcement is the substantial extra margin between the actual performance and the minimum power dissipation required to perform the intended safety function. MP&L also committed to promptly request and has filed by this letter a Technical Specification change in this area. During the interim period that the discretionary enforcement is in effect, the operability of the standby gas treatment system will be administratively controlled to prohibit operation outside of the bounds proposed in the new specification which provides a substantial margin above the minimum of approximately 21.5 KW required to reduce the air leaving the heaters to 70% relative humidity.

In accordance with the provisions of 10 CFR 50.30, three (3) signed originals and forty (40) copies of the requested amendment are enclosed. The attachment provides the complete technical justification and discussion to support the requested amendment. This amendment has been reviewed and accepted by the Plant Staff Review Committee (PSRC) and the Safety Review Committee (SRC).

Based on the guidelines presented in 10 CRF 50.92, it is the opinion of MP&L that this proposed amendment involves no significant hazards considera-tions.

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AECM-86/0053-Page 3 Based on the guidance provided in;10 CFR 170.21; MP&L has determined that the' application fee is $150.~ A'resittance of-$150.-is attached to this

-letter.

Due to,the prompt nature of this m atter, your assistance and cooperation ;

is appreciated.

Yours- uly, s t

ODK:rg Attachments cc: Mr. T. H. Cloninger (w/a)

Mr. R. B. McGehee (w/a)

Mr. N. S. Reynolds (w/a)

Mr. H. L.. Thomas (w/o)

Mr. R. C. Butcher (w/a)

Mr. James M. Taylor, Director (w/a)

Office of Inspection & Enforcewent U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Dr. J. Nelson Grace, Regional Administrator (w/a)

U. S. Nuclear Regulatory Commission Region II 101 Marietta St. , N. W. , Suite 2900 Atlanta, Georgia 30323 Dr. Alton B. Cobb (w/a)

State Health Officer State Board of Health Box 1700 Jackson, Mississippi 39205 a

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