ML20084C589

Provides Advance Notification of Intent to Propose Tech Spec Changes to Circulation speed-high Trip Setting Listed in Table 4.4-3 & Surveillance Requirement SR 5.3.7 for Secondary Coolant Monitoring

ML20084C589
Person / Time
Site:	Fort Saint Vrain
Issue date:	04/16/1984
From:	Warembourg D PUBLIC SERVICE CO. OF COLORADO
To:	Wagner P NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
P-84112, TAC-55294, NUDOCS 8404300123
Download: ML20084C589 (2)

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P-84112 Mr. Phil C. Wagner, Project Manager Region IV Nuclear Regulatory Commission 611 Ryan Plaza Drive Suite 1000 Arlington, TX 76011 Docket No. 50-267

SUBJECT:

Intentions for Technical Specification Changes to i

Table 4.4-3 and SR 5.3.7

Dear Mr. Wagner:

This letter is to provide advance notification of Public Service Company's intentions to propose Technical Specification changes to the Circulator Speed-High (steam) trip setting listed in Table 4.4-3 and the Surveillance Requirement, SR 5.3.7, for Secondary Coolant activity monitoring.

Public Service Company will propose that the circulator overspeed trip setting be increased to avoid unwarranted circulator shutdowns in preparation for consistent 100% power operation. The increase in trip setting, 11000 to 11700 rpm (115% to 123% rated), would continue to ensure the initiation of necessary protective actions prior to reaching the postulated maximum credible overspeed condition of 135%

rated or the blade shedding safety limit of 170% rated. This change will be proposed exclusive of the general Section 4.4 Setpoint Reevaluation program proposal due to the anticipated near term benefits at 100% power operation.

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% The proposed change to SR 5.3.7 would decrease the activity level at which the frequency for sampling and analysis of the secondary coolant must be increased.

Upon reaching a secondary coolant activity level of 10% of the safety limit of LC0 4.3.8 (presently 25%), the frequency of sampling and analysis would be increased from weekly to daily and would continue on a daily basis until the activity levels decrease to less than 10% of LC0 4.3.8.

Public Service Company feels that this requirement is necessary in assuring that secondary coolant activity levels, along with personnel exposure, health physics coverage, and radioactive waste shipments, are kept ALARA.

Public Service Company will also propose that the requirements for increased sampling and analysis frequency when activity levels increase "by a factor of 25% over the previous equilibrium value", be deleted. Due to the very low level of activity normally present in the secondary coolant, 0.01% of the limit of LCO 4.3.8, variations of 25% are considered normal and not indicative of a significant activity increase, which is the intent of this requirement. A single action level at 2 10% of the limit of LC0 4.3.8 is considered adequate to monitor secondary coolant activity and more conservative than the present requirements.

These proposed changes are expected to be submitted following review and approval by the Nuclear Facilities Safety Committee at the next scheduled meeting in May, 1984.

If you have any questions, please contact me at (303) 785-2224.

Very truly yours, d 7TN/

Don Warembourg-Manager, Nuclear Production DWW/djm 4

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