ML20210D517

Discusses Recommendations of Task Force Re Problems w/post- Accident Liquid Sampling Sys,Noted in .Current Sys Does Not Provide Reliability W/Level of Consistency That Util Expects.Proposed Schedule for New Sys Provided

ML20210D517
Person / Time
Site:	Oconee
Issue date:	01/02/1987
From:	Tucker H DUKE POWER CO.
To:	Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8702100106
Download: ML20210D517 (2)

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DUKE Powen GOMPANY I P.O. Box 33180 CHARLOTTE, N.C. 28242 HALD. TUCKER

• TELEPHONE Vtta PmESIDENT (704) 373-4531 n T gi \

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l January 2, 1987 1

Dr. J. Nelson Grace, Regional Adminintrator U. S. Nuclear Regulatory Commission Region II l 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323

Subject:

Oconee Nuclear Station l Docket Nos. 50-269, -270, -287 Daar Dr. Grace:

By letter dated August 13, 1986, Duke Power Company advised the NRC/ Region II of reliability problems associated with the Oconee PALSS system. At that time Duke was assembling a multi-departmental taskforce to resolve these problems to improve overall system reliability. This task force has evaluated the potential alternatives and has recommended a course of action with which we intend to i proceed.

The Duke Post-Accident Liquid Sampling System (PALSS) task force has concluded that the current system does not provide reliability with the level of consistency that Duke expects. Thus, Duke intends to replace the current system with a new design.

In concept, this new design reduces the complexity of the system, provides better dilution control, and improves the instrumentation on the control panel which should improve sample accuracy and reproducibility of results.

This is an extensive modification including a complete redesign of the PALS System, l removal of the current system and fabrication and installation of the new design.

Dasign work on the new system is currently underway. The proposed schedule for implementation of the new PALSS is:

January 1, 1988, complete design and fabrication of one new system June 1, 1988, complete installation of the new system on Unit 3

- December 1, 1988, complete functional testing, procedures and training on new system; determine reliability.

- January 1, 1989, publish schedule for implementation on remaining units The new design will be implemented initially on one unit to allow for extensive testing of the system prior to full implementation. The installation schedule of the new PALS System on the remaining two units will be determined upon successful demonstration of reliability of the new system on Unit 3. Appropriate sample taps will be installed on each unit at the next available refueling outage to reduce the outage dependency of sampic system installation, n {'

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0 Dr. J. N21 con Grcco, R:giennl Adminictrater January 2, 1987 Page Two The present system will remain in service until such time as it is replaced by the new design. Quarterly functional testing will be performed while the current system is in service. Every effert will be made to maintain this system in a functional condition capable of obtaining a reactor coolant sample. Please be advised that the committed acceptance criteria may not be met on all parameters on each functional test. However, the present system, together with other plant indicators, is sufficient to identify that we have significant core damage during an accident.

If there are any questions or concerns regarding this matter, please do not hesitate in contacting us through normal Licensing channels.

Very truly yours, Hal. B. Tucker fh PFG/45/slb xc: Ms. Helen Pastis Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Mr. J. C. Bryant NRC Resident Inspector Oconee Nuclear Station

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