ML20042G962

Proposed Tech Specs Re Min Frequencies for Sampling Tests of Reactor Coolant,Safety Injection & Refueling Water Tank, Concentrated Boric Acid Tanks & Spent Fuel Pool

ML20042G962
Person / Time
Site:	Fort Calhoun
Issue date:	05/10/1990
From:	OMAHA PUBLIC POWER DISTRICT
To:
Shared Package
ML20042G958	List: ML20042G957 ML20042G959 ML20042G962 ML20042G973
References
NUDOCS 9005160340
Download: ML20042G962 (4)

Text

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i TABLE 3-4 (Continued)

MINIMUM FRE0VENCIES FOR SAMPLING TEST Type of Measurement Sample and Analysis and Analysis .Freauency

l. Reactor Coolant (Continued)

(c) Cold Shutdown (1) Chloride I per 3 days (Operating Mode 4)

(d) Refueling Shutdown (1) Chloride 1 per 3 days (3)

(Operating Mode 5) (2) Boron Concentration 1 per 3 days (3)

(e) Refueling Operation (1) Chloride 1 per 3 days (3)

(2) Boron Concentration 1 per shift (3)

2. SIRW Tank Boron Concentration 1 per 31 days

3. Concentrated Boric Acid Boron Concentration 1 per 31 days l Tanks

4. SI Tanks Boron Concentration 1 per 31 days

5. Spent Fuel Pool Boron Concentration 1 per 31 days (1) Until the radioactivity of the reactor coolant is restored to s 1 Ci/gm DOSE EQUIVALENT I-131.

(2) Sample to be taken after a minimum of 2 EFPD and 20 days of power operation have elapsed since reactor was suberitical for 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or longer.

(3) Boron and Chloride sampling / analyses are not required when the core has been off-loaded. Reinitate boron and chloride sampling / analyses one

shift prior to reloading fuel into the cavity to assure adequate shutdown margin and allowable chloride levels are met, i:

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m D.LSCUSSION OF CHANGE The proposed amendment to the Technical Spocification allows for suspension of boron and chloride sampling in the reactor vessel when all fuel has been removed. Sampling will be reinitiated arior to reintroduction of the fuel into  !

the reactor vessel to insure adequate slutdown margin and chloride chemistry l 1evels are met. '

Suspension of boron and chloride sampling of the reactor vessel coolant when all fuel is removed will not affect the plant safety since no fuel is present.

The reactor vessel coolant boron concentration requirement is based on the need for adequate shutdown margin when fuel it pensent. When all the fuel is removed, the need for boron is eliminated and hence the need for sampling is eliminated. Elimination of the sampling requirement for the reactor vessel head removal will not adversely impact the safe speration since the shutdown margin calculations do not credit the CEA's. The' intent of the reactor vessel head removal would be to ensure CEA's were not inadvertently withdrawn causing a criticality excursion, however since the refueling shutdown calculations include an all rods out assumption, then the deletion of the boron shift sampling requirements will not change the safety analyses.

The deletion of the chloride samaling will not adversely impact the fuel since the purpose of maintaining the c11oride chemistry level is to meet warranty obligations of the fuel vendor and reduce the possibility of intergranular stress corrosion cracking in the fuel assembly material. The chloride chemistry level is established to prevent any potential degradation of the fuel mechanical design properties or RCS piping. The chloride chemistry level of the fuel assemblies is met by sampling of the Spent fuel pool.

@STIFICATION The suspension of reactor vessel coolant boron sampling or chloride sampling when all fuel is removed from the vessel does not compromise or affect the safety of the plant operation.

NO SIGNlflCANT HAZARDS The proposed amendment to the Technical Specification allows for suspension of boron and chloride sampling in the reactor vessel when O' fuel has been removed, The Technical Specification document changes required are contained in pages 2-37, 2-38, and 3-19 of Sections 2.8 and 3.2.

The reactor vessel coolant boron concentration requirement is based on the need "

for adequate shutdown margin when fuel is present. When all the fuel is removed, the need for boron is eliminated and hence the need for sampling is eliminated. Elimination of the sampling requirement for the reactor vessel head removal will not adversely impact the safe operation since the shutdown  !

margin calculations do not credit the CEAs. The intent of the reactor vessel head removal would be to ensure CEAs were not iradvertently withdrawn causing a

, criticality excursion, however since the refuelSg shutdown calculations include an all rods out assumption, then the deletion of the boron shift sampling requirements will not change the safety analyses.  ;

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The deletion of the chloride sampling will not adversely impact the fuel since the purpose of maintaining the chloride chemistry level is to meet warranty obligations of the fuel vendor and reduce the possibility of intergranular stress corrosion cracking in the fuel assembly material. The chloride chemistry level mechanical is established design properties orto prevent RCS anyTh.otential piping. c chloridedegradation of theoffuel chemistry icvel the fuel assemblies is met by sampling of the Spent Fuel Fool.

BAS 15 FOR NO SIGNIFICANT HAZARDS DETERMINATION This proposed amendment does not involve a significant hazards consideration because the operation of Fort Calhoun Station in accordance with this amendment would not:

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1) Involve a significant increase in the arobability or consequences of an i accident previously evaluated. This c1ange allows for the suspension of boron and chloride sampling during the time the fuel is removed from the reactor vessel with no changes in specifications. Since the fuel source is removed, shutdown margin in the reactor vessel is not required and hence boron sampling is not required and the mechanical design properties of the fuel or RCS piping are not subject to potential degradation due to intergranular stress corrosion cracking potentially induced by a high chloride level. Therefore, this change does not increase the probability or consequences of a previously evaluated accident.

2) Create the possibility of a new or different kind of accident from any l accident previously evaluated, it has been determined that a new or different kind of accident is not created because no new or different modes of operation are proposed for the plant. The use of the proposed revised Technical Specification controls will not result in the possibility of a l new or different kind of accident. '

3) Involve a significant reduction in a margin of safety. Specifications involving the boron sampling ensure that the shutdown margin conforms to current plant conditions and, therefore, preserves the margin of safety.

Since the fuel source is removed, shutdown margin in the reactor vessel is not required and hence boron sampling is not required. The fuel manufacturer's chloride chemistry requirements are set by sampling of the S)ent Fuel pool during the period the core is offloaded. This maintains a tie mechanical design properties of the fuel. Consolidation of all the  !

boron and chloride sampling requirements in one location in the Technical l Specifications ensures compliance of sampling requirements and, therefore, will not reduce the margin of safety.

Based on the above considerations, OPPD does not believe that this amendment involves a significant hazards consideration.

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