Text

Proposed Tech Specs,Changing Ac Electrical Power Sources
	ML20195C918
Person / Time
Site:	Grand Gulf
Issue date:	05/22/1986
From:	; MISSISSIPPI POWER & LIGHT CO.
To:	;
Shared Package
ML20195C913	List: AECM-86-0157, Application for Proposed Amend PCOL-86/10 to License NPF-29, Changing Tech Specs Re Ac Electrical Sources in Response to Generic Ltr 84-15.Fee Paid; ML20195C918;
References
	TAC-55863, NUDOCS 8606020024
	Download: ML20195C918 (27)
	v • d • e

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NLS-85/17

SUBJECT:

Technical Specification 3.8.1.1 Action Statements a through f, Surveillance Requirements 4.8.1.1.2.a.4 and 4.8.1.1.2.a.5, Table 4.8.1.1.2-1, Bases 3/4.8.1; pages 3/4 8-1, 8-2, 8-3, 8-8, and B 3/4 8-la.

DISCUSSION:

The onsite and offsite electric power systems for Grand Gulf are described in FSAR Chapter 8.0.

The station is supplied AC power by two 500 KV lines from the system grid to the 500KV switchyard.

Two service transformers supplied from the 500KV switchyard provide two sources of power to the Class IE and 80P electric systems. A third source of power to the Class IE electrical system is provided from a separate 115KV line. The onsite Class IE AC power system is divided into three independent divisions to provide AC power to the three divisions of ESF loads. An alternate source of AC power for each ESF division is an associated diesel generator which will automatically supply power to its ESF bus in case of a loss of preferred power source. A simplified one line diagram is attached to show the Grand Gulf AC electrical power arrangement.

The proposed changes affect the allowed out of service time requirement and surveillance requirements for both the offsite and onsite A.C. electrical sources.

Some of the changes are in response to the NRC's Generic Letter 84-15, " Proposed Staff Actions to Improve and Maintain Diesel Generator Reliability",

dated July 2, 1984; while other changes are proposed to decrease diesel generator testing while another diesel generator is being tested or is out for planned preventative maintenance.

Specific changes are proposed as follows:

Present Action a has been divided into Action a, for a required offsite circuit inoperable, and Action b, for a required diesel generator 11 or 12 inoperable.

Action a:

1) Extend the time requirement and reduce the periodicity for performing Surveillance Requirement 4.8.1.1.2.a.4 from within two hours and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter, to once within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months if the diesels have not been successfully tested within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months prior to entry into this ACTION Statement, g

2) The restoration statement is clarified by requiring the offsite circuit to be returned to operable status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time of initial loss.

0606020024 060522 PDR ADOCK 05000416 P

PDH J16ATTC86010701 - 1

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Action b:

1)

If the out of service diesel generator 11 or 12 became inoperable due to preplanned preventative maintenance or testing, the remaining operable diesel generator 11 or 12 would not be tested per Surveillance Requirement 4.8.1.1.2.a.4

2) Extend the time requirement and reduce the periodicity for performing Surveillance Requiremen,t 4.8.1.1.2.a.4 from within two hours and at least onds per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter, to once within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months if the remaining diesel generator 11 or 12 has not been successfully tested within the previous 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

3) Delete diesel generator 13 testing as a result of diesel generator 11 or 12 being inoperable including reference to the "*" footnote.

4) The restoration statement is clarified by requiring the inoperable diesel generator 11 or 12 to be i

returned to operable status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time of initial loss.

r Present Action b has been changed to Action c.

Action c:

1) Extend the time requirement and reduce the periodicity for performing Surveillance Requirement 4.8.1.1.2.a.4 from within two hours and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter, to once witrin 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months for one of the required offsite circuit and diesel generator 11 or 12 inoperable.

2) Delete the sentence requiring restoration of at least two of the required offsite circuits and diesel generators 11 and 12 to operable status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time of initial loss.

l Present Action c has been changed to Action d.

Action d:

1) Reference to Action a or b is changed to Action b, c or i.

Present Action d has been changed to Action e.

Action a:

1) Extend the time and reduce the periodicity for performing Surveillance Requirement 4.8.1.1.2.a.4 from J16ATTC86010701 - 2

within two hours and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter, to once within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months for two of the required offsite circuits inoperable.

2) Delete the sentence requiring restoration of at least two offsite circuits to operable status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time of initial loss.

Present Action e has been changed to Action f.

Action f:

1)

Extend the time and reduce the periodicity for performing Surveillance Requirement 4.8.1.1.2.a.4 from within two hours and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter, to once within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months for the condition when diesel generators 11 and 12 are inoperable.

2) Delete the sentence requiring restoration of both diesel generators 11 and 12 to operable status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time of initial loss.

Present Action f has been changed to Action 9 Action 9:

1) With diesel generator 13 inoperable, delete the requirement to test the remaining operable diesel generators pursuant to Specification 4.8.1.1.2.a.4.

Actions h and i are new requirements not in present technical specifications.

Action h:

1) Newly proposed action h combines the requirements of proposed actions a and 9 to provide far the situation where one of the required offsite A.C. electrical power sources and diesel gererator 13 are inoperable.

Action i:

1) Newly proposed action i combines the requirements of proposed actions b and g to provide for the situation where either diesel generator 11 or 12 and diesel generator 13 are inoperable.

Surveillance Requirement 4.8.1.1.2.a.4:

i l

J16ATTC86010701 - 3

1) Add a "*" footnote to relax the present fast start requirements. All diesel generator starts may be preceded by an engine prelube period. The diesel generator start (10 sec) from standby conditions shall be performed at least once per 184 days in these surveillance tests. All other engine starts for the purpose of this surveillance testing may be preceded by warmup procedures as recommended by the manufacturer so that the mechanical stress and wear on the diesel engine is minimized. This change requires demonstration of the 10 second start criteria only once per 184 days.

Surveillance Requirement 4.8.1.1.2.a.5:

1) Add a "#" footnote to relax the present diesel generator loading requirements. The diesel generator loading (60 sec) shall be performed at least once per 184 days in these surveillance tests. All other diesel engine runs for the purpose of this surveillance testing may include gradual loading as recommended by the manufacturer so that the mechanical stress and wear on the diesel engine is minimized. This change requires demonstration of the 60 second loading criteria only once per 184 days.

Table 4.8.1.1.2-1:

1) Remove test frequencies of 14 days and 3 days.

2) Change the criteria for the 7 day test frequency to greater than 4 diesel generator failures in the last 100 valid tests and greater than 1 diesel generator failures in the last 20 valid tests.

3) Change the criteria for the 31 day test frequency to less than or equal to 4 diesel generator failures in the last 100 valid tests and less than or equal to 1 diesel generator failures in the last 20 valid tests.

4) Change the criteria for determining failures to a per diesel generator basis instead of the present per nuclear unit basis.

5) Add a reference to exceptions to Regulatory Guide 1.108 as noted in the FSAR.

6) Add the methodology for transvaluing the number of diesel generator failures to zero.

7) Delete the statement " Entry into this test schedule shall be made at the 31 day test frequency".

J16ATTC86010701 - 4

Bases 3/4.8.1:

1) Add exceptions taken with respect to Regulatory Glide 1.108 requirements.

Attached to this proposed change are marked up technical specification pages reflecting the proposed changes.

JUSTIFICATION:

The various changes discussed above are justified as follows:

Action a:

Present Action a contains requirements with either one offsite source or diesel generator 11 or 12 inoperable. The proposed change will split present Action a into Action a for one offsite source inoperable and Action b for diesel generator 11 or 12 inoperable.

The remaining action statements have been renumbered to accommodate the split of present Action a.

Present test requirements for diesel generators 11, 12 and 13 with one of the required offsite sources inoperable are to perform 4.8.1.1.2.a.4 for one diesel generator at a time, within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter. The proposed change will allow diesel generator testing to be performed once within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months if the diesel generator has not been successfully tested within the previous 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . The proposed change follows the guidance provided in Generic Letter 84-15 to reduce excessive diesel generator testing and thereby enhance the reliability of the diesel generators.

Diesel generator testing within the first 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months will provide assurance that no starting problems exist with the diesels and will provide additional time for inspection prior to the test.

For the specific case when only one of the required offsite sources is declared inoperable, diesel generator failure is not involved and diesel generator reliability has not been degraded. Therefore, demonstration of operability should not be required a second time if the diesels have been successfully tested within the previous 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

This again will reduce the potential for excessive testing.

The restoration requirements for one of the required offsite A.C. sources being inoperable have been clarified by adding the phrase "from time of initial loss" after the 72 hour8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restoration statement.

This phrase is being added to proposed Actions a and b and is being deleted from present Actions b, d, and e.

Present Actions b, d, and e specify requirements when two A.C. electrical power sources are inoperable. When one of the inoperable A.C. electrical power sources is returned to J16ATTC86010701 - 5

w operable status, present Action b, d, or e, as applicable, is exited and present Action a is entered for one of the required

4. C. electrical power sources inoperable. Therefore, the restoration requirement in present Actions b, d, and e for restoration of two of the required A. C. electrical power sources within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time of initial loss is never entered or used.

This requirement is adhered to, however, by entering present Action a where present plant interpretations require restoration of both required A. C. electrical power sources within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time of initial loss. This change does not alter present interpretations or plant actions but rather clarifies the requirements by placing them in the appropriate action statements.

This proposed change follows the guidance provided in Generic Letter 84-15 to reduce excessive diesel generator testing and thereby enhance the reliability of the diesel generators.

Action b:

Proposed Action b contains the action requirements if either diesel generator 11 or 12 is inoperable. The proposed changes will reduce excessive diesel generator starts by:

1) Not testing the remaining diesel generator 11 or 12 if the out of service diesel generator became inoperable due to preplanned preventative maintenance or testing.

2) Extending the present time requirements for testing the operable diesel generator 11 or 12 from within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter, to once within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months if the operable diesel generator 11 or 12 has not been tested within the last 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

3) Not requiring diesel generator 13 testing as a result of diesel generator 11 or 12 being inoperable.

If diesel generator 11 or 12 is declared inoperable to perform preplanned preventative maintenance or testing, then the operability of the remaining diesel generator 11 or 12 is not in question and additional testing of the remaining diesel generator should not be required. Also, the required offsite sources are operable while in this action statement thus assuring availability of AC electrical power when required.

As proposed in Action a above, the present requirement to perform Surveillance Requirement 4.8.1.1.2.a.4 for the remaining operable diesel generator 11 or 12, within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter, is changed to once within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months if the diesel has not been successfully tested within the previous 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

This proposed change follows the guidance provided in Generic Letter 84-15 to reduce excessive diesel generator testing and thereby enhance the reliability of the diesel generators.

J16ATTC86010701 - 6

Diesel generator 13 was manufactured by Electromotive Division of General Motors while diesel generators 11 and 12 were manufactured by Transamerica Delaval. The primary reason to perform a diesel operability test following the loss of diesel generator 11 or 12 is to ensure that the remaining diesel generator will be available and capable of starting and loading as designed. Specifically, an operability test of the remaining diesel generators provides assurance that the remaining operable diesel generators are not experiencing the same type of failure (i.e. common mode failure). Since diesel generator 13 is not the same type or supplied by the same manufacturer as diesel generator 11 or 12, common mode failure is not a probable occurrence.

In-the event of loss of one offsite source, proposed Action a requires all 3 diesel generators to be tested pursuant to 4.8.1.1.2.a.4.

Testing of all 3 diesels is justified in this case since loss of one offsite source degrades the operability of all ECCS systems that rely on A.C. power. However, the loss of diesel generator 11 or 12 only degrades the availability of Division I or Division II equipment and in no way infers degradation of Division III availability.

As described for Action a above, the restoration requirements for diesel generator 11 or 12 inoperable has been clarified by adding the phrase "from time of initial loss". This requirement in proposed Action b is justified as described above for Action a, is provided for clarification only, and does not change present plant interpretations of action requirements.

Action c:

The time requirement for testing the remaining two operable diesel generators is presently within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months and once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter. The proposed change will require testing of the operable diesel generators pursuant to Specification 4.8.1.1.2.a.4 only once within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . This change is consistent with the recommendations of Generic Letter 84-15 and is intended to reduce unnecessary diesel generator testing, thus increasing availability and reliability.

The last sentence of present Action b has been deleted with the proposed Action c changes.

The deletion of the restoration statement for two offsite circuits and diesel generators 11 and 12 within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months is purely administrative and is proposed only for clarification.

Present interpretations of action requirements by plant staff would require exiting proposed Action c when one offsite circuit or when either diesel generator 11 or 12 is returned to operable and entering proposed Action a or b for one remaining inoperable offsite circuit or diesel generator 11 or 12.

J16ATTC86010701 - 7

Action d:

The only change to Action d is editorial in nature due to the proposed renumbering of the action statements and the addition of new Action i. Reference to Action a or b is changed to Action b, c or i, as applicable.

Action e:

Present test requirements for diesel generators 11, 12 and 13 with two of the required offsite circuits inoperable are to perform 4.8.1.1.2.a.4 for one diesel generator at a time, within two hours and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter.

The proposed change will allow diesel generator testing to be performed once within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . The proposed change follows the guidance provided in Generic Letter 84-15 to reduce excessive diesel generator testing and thereby enhance the reliability of the diesel generators. Diesel generator testing within the first 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months will provide assurance that, with two of the required offsite A.C. sources inoperable, the diesel generators will perform their design function.

The restoration requirement of 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months for both of the inoperable offsite circuits is deleted from present Action d and not included in proposed Action e.

As discussed in the justification for proposed Action c changes above, this change is purely administrative in nature since the 72 hour8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months requirement from time of initial loss is now included in proposed Action a.

Action f:

With both diesel generators 11 and 12 inoperable, diesel generator 13 is presently required to be tested within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months and at least once per L hours thereafter. The proposed change will require diesel generator 13 testing only once within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .

This change is similar to that proposed for Action e for two of the required offsite circuits inoperable. This change will reduce unnecessary testing on diesel generator 13 while providing assurance that the diesel can start and perform its intended design function.

Other provisions of Action f require either diesel generator 11 or 12 to be returned to service within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in hot shutdown within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in cold shutdown within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

Since action must be taken to shut the plant down if either diesel generator 11 or 12 is not returned to service within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , testing of the remaining diesel generator 13 once within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months provides assurance that this diesel generator is operable while the plant is being taken to cold shutdown.

Excessive testing of the remaining diesel generator 13 during this plant shutdown may reduce the reliability of the one l

operable onsite A.C. source.

1 1

i J16ATTC86010701 - 8

The 72 hour8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restoration statement for both diesel generators 11 and 12 being inoperable is deleted from proposed Action f.

This change is similar to that discussed in Action c above and is purely administrative in nature. The 72 hour8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restoration statement is included in proposed Action b for either diesel generator 11 or 12 inoperable. Action b would be entered when one of the inoperable diesel generators 11 or 12 is returned to operable status, thus retaining the requirement to restore both diesel generators 11 and 12 to operable within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months of initial loss.

Action g:

Present Action f for diesel generator 13 inoperable requires testing of diesel generators 11 and 12 within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter. The proposed change deletes the requirement to test diesel generators 11 and 12.

Diesel generator 13 supplies power to only the HPCS system (Division III) and is not connected to diesel generators 11 or 12 or the loads they supply. Diesel generator 13 is manufactured by the Electromotive Division of General Motors while diesel generators 11 and 12 are manufactured by Transamerica Delaval. Since these diesels (13 and 11 or 12) are not ::imilar then common mode failure is not a likely occurrence.

The failure of diesel generator 13 for the High Pressure Core Spray System does not degrade the functioning of diesel generators 11 or 12 and should not necessitate their testing. This proposed change will reduce unnecessary testing requirements for diesel generators 11 and 12 and help to increase their reliability and availability.

Action h:

Proposed Action h is a new requirement to specify appropriate action when one offsite circuit of the required A.C.

electrical power sources and diesel generator 13 are inoperable. Action a and g are the appropriate measures to follow for this situation and the requirements of these action statements are included for completeness in proposed Action h.

Proposed Action h adds action requirements not currently addressed in the technical specifications so that entry into Technical Specification 3.0.3 can be avoided when one required offsite circuit and diesel generator 13 are inoperable.

Action 1:

Proposed Action i is a new requirement to specify appropriate action when either diesel generators 11 or 12 and diesel generator 13 are inoperable. Actions b and g are the appropriate measures to follow for this situation and the requirements of these action statements are included for completeness in proposed Action i.

Proposed Action i adds action requirements not currently addressed in the technical specifications so that entry into Technical Specification 3.0.3 can be avoided when either diesel generators 11 or 12 and diesel generator 13 are inoperable.

J16ATTC86010701 - 9

Surveillance Requirements 4.8.1.1.2.a.4 and 4.8.1.1.2.a.5:

A footnote is proposed to be added to each of these surveillance requirements to specify relaxations in the present cold start and loading requirements. With the proposed changes all diesel generator starts for the purpose of these surveillance requirements may be preceded by an engine prelube period. The footr les propose that diesel generator starts (10 sec) and loading (60 sec) from standby only be performed once per 184 days. All other starts for the purpose of satisfying Surveillance Requirements 4.8.1.1.2.a.4 and 4.8.1.1.2.a.5 may be preceded by warmup procedures and may also include gradual loading as recommended by the manufacturer so that the mechanical stress and wear on the diesel engine is minimized (i.e., the 10 second start criteria and the 60 second load criteria do not have to be demonstrated for these other tests.) The proposed changes follow the guidance provided in Ganeric Letter 84-15 to reduce cold fast starts. As stated in Generic Letter 84-15, it is the NRC staff's technical judgement that an overall improvement in diesel engine reliability and availability can be gained by performing diesel generator starts for surveillance testing using engine prelube and other manufacturer recommended procedures to reduce engine stress and wear. The proposed change incorporates these recom-mendations by allowing a prelube period before diesel starts, by requiring fast start criteria (10 sec) and fast load criteria (60 sec) to be imposed only once per 184 days, and by allowing warmup and gradual loading for tests other than those performed once per 184 days.

Table 4.8.1.1.2-1:

The new proposed test frequencies of 31 and 7 days follow the guidance provided in Generic Letter 84-15. However, Generic Letter 84-15 provides only for decreased test frequency based on the number of failures in the last 20 valid tests. MP&L is providing by this proposed change more stringent test requirements than Generic Letter 84-15 in that the number of failures in the last 100 valid tests is also used to decrease the test frequency from once per 31 days to once per 7 days.

These provisions are similar to other recently licensed BWR/6 plants and provide adequate testing requirements to ensure proper functioning of the onsite power systems without excessive starts and runs.

The criteria for determining number of failures and number of valid tests is currently based on a per nuclear unit basis.

The proposed change is to a per diesel generator basis following the guidance in Generic Letter 84-15.

Presently, with one diesel generator experiencing failures, the test frequency for all three diesel generators is increased. This i

increased testing on diesel generators which have not experienced valid failures decreases their reliability and increases the potential for wear related problems.

J16ATTC86010701 - 10

e The exceptions MP&L has taken with respect to Regulatory Guide requirements are specified in the FSAR. A clarification is added to the "*" footnote to specify that exceptions taken with respect to Regulatory Guide 1.108, Revision 1 August 1977 requirements are noted in the FSAR.

The "*" footnote is also modified by adding provisions to reduce the test failure count to zero if a major diesel overhaul is completed. This major dic:cl overhaul will be followed by post-maintenance operation and testing approved by the manufacturer and will require NRC acceptance of diesel generator reliability. These provisions specify methods that can be used to reduce the test failure count while maintaining controls to ensure appropriate reliability is maintained.

The present statement that entry into this test schedule shall be made at the 31 day test frequency has been deleted.

The number of valid failures determines the frequency of-testing thus negating the need for this statement.

Bases 3/4.8.1:

The proposed change to Bases 3/4.8.1 provides exceptions taken with respect to Regulatory Guide 1.108 requirements. These exceptions are in regard to Technical Specification Table 4.8.1.1.2-1 requirements regarding test frequency and determination of valid failures. The proposed exceptions comply with provisions contained in Generic Letter 84-15 and are intended to provide adequate assurance of diesel generator availability without causing degradation due to excessive engine starts.

SIGNIFICANT HAZARDS CONSIDERATIONS:

Pursuant to 10 CFR 50.92, Mississippi Power and Light has evaluated the proposed amendment and has determined that its adcption would not involve a significant hazard. The basis for this determination is as follows:

PROPOSED CHANGES TO TECHNICAL SPECIFICATION 3/4.1.1 Changes to Technical Specification 3.8.1.1 action statements are proposed to eliminate excessive testing requirements that currently exist with offsite and/or onsite emergency AC power sources inoperable. Changes are also proposed to add new action requirements (Actions h and 1) to address situations not presently covered in Technical Specification 3.8.1.1.

Clarifications are proposed by deleting restoration requirements for two AC sources inoperable from present Actions b, d, and e and including thest requirements in proposed Actions a or b J16ATTC86010701 - 11

for one AC source inoperable.

Changes to Technical Specification 4.8.1.1 surveillance requirements are proposed to reduce the number of cold fast starts and loading on the diesel generatcrs and to reduce the frequency of testing in relationship to valid failures.

BASIS Proposed Action a:

The proposed diesel generator test requirements of once within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months if the diesel generator has not been successfully tested within the past 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months will provide assurance that no starting problems exist with the diesels. The 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months interval will eliminate excessive testing and follows the guidance provided in Generic Letter 84-15.

The addition of the phrase "from time of initial loss" is a clarification only, and does not alter present action requirements in this regard.

Proposed Action b:

This action statement provides steps to be taken when either diesel generator 11 or 12 is inoperable. The 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months test frequency for the remaining operable diesel generator 11 or 12 is conditioned on whether the inoperable diesel is out for preplanned preventative maintenance or testing. This conditional requirement is intended to prevent unnecessary testing of the remaining diesel since no failures modes are indicated in this situation. Diesel generator 13 testing is not required when either diesel generator 11 or 12 is inoperable since the diesels (13 compared to 11 and 12) are not of similar manufacturer and diesel generator 13 (Division III) is electrically independent from the other diesels (Division I and II). As described for Action a above, the phrase "from time of initial loss" is added for clarification.

Proposed Action c:

The proposed test frequency of once within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is consistent with the recommendations of Generic Letter 84-15 and is intended to reduce unnecessary testing while maintaining diesel generator availability and reliability.

Since this proposed Action c involves the loss of one of the required offsite circuits, testing of all the remaining operable diesel generators is required as in proposed Action a for loss of only one offsite circuit.

The present action requirement (Action b) to restore two offsite circuits and diesel generators 11 and 12 within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months is not included in proposed Action c but is included in proposed Actions a and b.

J16ATTC86010701 - 12

Proposed Action d:

The only change proposed is editorial in nature due to the renumbering of the action statements and the addition of new Action i.

Proposed Action e:

The proposed test frequency of once within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months is consistent with the recommendations of Generic Letter 84-15 and is intended to reduce unnecessary testing while maintaining diesel generator availability and reliability. The 72 hour8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restoration requirement for both of the inoperable offsite circuits is not included in proposed Action e but is moved to Action a for clarification purposes.

Proposed Action f:

The proposed test frequency of once within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months for diesel generator 13 is similar to that proposed for Action e for 2 offsite circuits inoperable.

Provisions of Action f require that either diesel generator 11 or 12 be restorec to operable status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or the plant be in hot shutdown within the next 12 hour:;.

Due to the short time frame for restoration of either diesel generator 11 or 12 with subsequent plant shutdown if one is not restored in 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , the 8 hour9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months limit for testing of diesel generator 13 provides assurance of onsite AC source availability while the plant is being shut down. The 72 hour8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months restoration statement for both diesel generators 11 and 12 is not included in proposed Action f but is moved to Action b for clarification purposes.

Proposed Action g:

The deletion of the requirement to test diesel generators 11 and 12 in response to an inoperable diesel generator 13 is proposed to reflect the onsite AC power design arrangement at Grand Gulf.

Division III is supplied onsite power by diesel generator 13 and is electrically independent from Divisions I and II (supplied by diesel generators 11 and 12). The independence of Division III in that it contains only High Pressure Core Spray System components provides justification to separate the testing requirements of diesel generator 13 from those of diesel generators 11 and 12 under certain conditions. Diesel generator 13 should only be required to be tested in response to a loss of one or both required offsite circuits which infers degradation of power to all three onsite electrical divisions or in response to loss of both diesel generators 11 and 12 which infers a serious degradation of onsite AC power sources.

The loss of J16ATTC86010701 - 13

diesel generator 13 by itself does not infer a serious degradation of onsite AC power sources and should not require testing of diesel generators 11 and 12. Also common mode failure is not inferred with diesel generator 13 inoperable since diesel generators 11 and 12 are from a different manufacturer than that of diesel generator 13.

Proposed Action h:

Proposed Action h is a new action requirement to address the situation where one offsite circuit of the required AC electrical power sources and diesel generator 13 are inoperable.

Proposed Action a addresses one offsite circuit inoperable and proposed Action g addresses diesel generator 13 being inoperable. The requirements of proposed Actions a and g have been combined for completeness to form Action h.

No new action requirements are included in proposed Action h other than those discussed above for proposed Actions a and g.

Proposed Action 1:

Proposed Action i is a new action requirement to address the situation where either diesel generator 11 or 12 and diesel generator 13 are inoperable. Action i was formed from the requirements of Actions b, d and g as discussed above and no additional changes are proposed.

Surveillance Requirement 4.8.1.1.2.a.4:

The proposed reductions in the number of cold fast starts follows the recommendations in Generic Letter 84-15.

The provisions to allow engine prelube periods and warmup procedures are intended to reduce engine stress and wear.

The requirement to perform diesel generator starts from standby conditions once every 184 days provides assurance that the design basis capability is adequately demonstrated.

Surveillance Requirement 4.8.1.1.2.a.5:

The proposed reductions in the number of fast loading follows the reduction in fast starts proposed above and follows the recommendations of Generic Letter 84-15. The provisions to allow gradual loading is intended to reduce mechanical stress and wear on the diesels. The requirement to perform 60 second diesel generator loading once every 184 days provides assurance that the design basis capability is adequately demonstrated.

J16ATTC86010701 - 14

Table 4.8.1.1.2-1:

The new proposed test frequencies are based on Generic Letter 84-15 recommendations with additional testing provisions added for the number of failures in the last 100 valid tests. The change to 31 and 7 day test frequencies is intended to reduce excessive testing while providing assurance of diesel generator availability when required.

The change to a per diesel generator basis to determine test frequency follows the guidance in Generic Letter 84-15 and is intended to reduce testing on diesel generators that have not experienced failures. The footnote change to allow reducing the test failure count to zero is intended to provide acceptable methods while ensuring adequate approval control.

MP8L has evaluated the proposed changes and considers them not to involve a significant hazards consideration for the following *easons.

(1) The proposed changes will not significantly increase the probability or consequences of an accident previously evaluated, because the changes will eliminate a practice of unnecessary and abusive diesel generator testing contained in the technical specifications.

Such testing contributes to accelerated diesel generator wear, which consequently degrades their reliability and availability.

New Actions h and i are derived from existing or proposed action requirements and are provided to address situations not covered by present action statements. Additional clarifications are provided in the action statements to provide restoration requirements consistent with present plant interpretations.

Separation of diesel generator 13 testing requirement from the other diesels for certain situations reduces unnecessary testing requirements while still assuring availability when required due to the electrical independence of Division III from Divisions I and II.

(2) The proposed changes will not create the possibility of a new or different accident from any accident previously evaluated, because no physical modifications are required to be made to the plant in conjunction with these proposed changes. The changes are intended to increase diesel generator reliability; therefore, availability of the onsite emergency power system as described in the FSAR will be enhanced.

i l

J16ATTC86010701 - 15

(3) The proposed changes will not involve a significant reduction in a margin of safety, because demonstration of diesel generator operability will be maintained as necessary to ensure operability and availability, and will be conducted on a more optimum test schedule that will improve the overall performance of the onsite emergency power system.

O J16ATTC86010701 - 16 i

3/4.8 ELECTRICAL POWER SYSTEMS 3/4.8.1 A.C. SOURCES A.C. SOURCES - OPERATING LIMITING CONDITION FOR OPERATION 3.8.1.1 As a minimum, the following A.C. electrical power sources shall be OPERnBLE:

a.

Two physically independent circuits between the offsite transmission network and the onsite Class IE distribution system, and b.

Three separate and independent diesel generators, each with:

1.

Separate day fuel tanks containing a minimum of 220 gallons of fuel.

2.

A separate fuel storage system containing a minimum of:

a) 57,200 gallons of fuel each for diesel generators 11 and 12, and j

b) 39,000 gallons of fuel'for diesel generator 13.

3.

A separate fuel transfer pump.

APPLICABILITY:

OPERATIONAL CONDITIONS 1, 2, and 3.

ACTION:

IN,f E'f? T~

'.!!th either ene effsite circuit ;r diesel ger.crator 11 ;r 12 :;f the above required A.C. electrical power sources inoperable, tiemonstr. ~

OPERABILITY of the remaining A.C. sources by performing S 11-lanc equirements 4.8.1.1.1.a within one hour and 4.8.1.1

.a.4,*

for one sel generator at a time, within two hours a at least once per 8 s thereafter; restore at least two site circuits and diesel gene ors 11 and 12,to OPERABLE s us within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months I

or be in at least SHUTDOWN within the 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the fo

' ng 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

i b.

With one offsite circuit and "s

generator 11 or 12 of the above required A.C. electrical power ces inoperable, demonstrate the OPERABILITY of the remaini A.C. so es by performing Surveillance l

l Requirements 4.8.1.1.1 within one hour d 4.8.1.1.2.a.4,* for one l

diesel generator a time, within two hours d at least once per l

8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months therea r; restore at least one of the ' perable A.C.

l sources to RABLE status within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or be in least HOT SHUT-

)

DOWN wi n the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN with the following 24 rs.

Restore at least two offsite circuits and diese nera-rs 11 and 12 to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time of itial l

loss or be in at least HOT SHUTOOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and i uutu anuivu-n.. m ;.. the felle--ing M heurs.

s

" Specification 4.8.1.1.2.a.4 must be performed for diesel generator 13 only when the HPCS system is OPERABLE:

l l

GRAND GULF-UNIT 1 3/4 8-1 Amendment No. _

l A

n

Insert for Technical Specification Page 3/4 8-1 ACTION:

a.

With one offsite circuit of the above required A.C. electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter.

If a diesel generator of the above required A. C. electrical power sources has not been successfully tested within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months prior to entry into this ACTION Statement, demonstrate its OPERABILITY by performing Surveillance Requirement 4.8.1.1.2.a.4* for one diesel generator at a time within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

Restore the offsite circuit to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time of initial loss or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

b.

With either diesel generator 11 or 12 of the above required A.C.

e7ectrical power sources inoperable, demonstrate the OPERABILITY of the above required A.C. offsite sources by performing Surveillance Requirement 4.8.1.1.1.a within I hour and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter.

If the diesel generator is inoperable due to any cause other than preplanned preventative maintenance or testing and the remaining diesel generator has not been successfully tested within 124 hours0.00144 days 0.0344 hours 2.050265e-4 weeks 4.7182e-5 months prior to entry into this ACTION Statement, demonstrate the OPERABILITY of the remaining OPERABLE diesel generator 11 or 12 by perfonning Surveillance Requirement 4.8.1.1.2.a.4 within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

Restore the inoperable diesel generator to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months from time of initial loss or be in at least H0T SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

b l

4 1

J16ATTC86050801 - 1

=

ELECTRiCALPOWERSYSTEMS LIMITINGCOND1TIOMF_0EOPENATf0N(Continued)

ACTION (Conti.1ued) p-

?.' $ :3tht-d! M scc <M W. t !! ef ?? Of th: :t:c: i:; 6 :d ^.C.

I electrical peicer sources inoperable, in addition to ACTION a or b above., as spp11 cable, verify within 2 nours that all required syst s,

ubsystems, trains, compocents anA devicas that depend on the

( alhing. diesel generator 11 or 12 as e scurce of emergency p er are 1so OPERABLE; otherwise, be in at taast HOT SHUTOOWN wi in the next - hours and in COLO SHUTDOWN within the following 24 ours.

d.

Wfth two the above required offsite circuits inoper e,

demonstrate ha OPERABILITY of three diesel generator by performing Surveillance a time, within quirement 4.8.1.1.2.a.4*, for one di sel generator at o hours and at least once per 8 ours thereaf ter, unless the diesel engrators are already opera 'ng; restore at least one of the-inoperabi offsite circuits to OP BLE status within 24 hcurs or be in at ast HOT SHUTDOWN wit-n the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

With only one offsite c cuit restored to PERABLE status, restore at least two offsite circ *ts to OPERAB status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months 4

from time of initial loss o be in at east HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months 'and in COLD SH 0WN thin the followl'ng 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

e.

With diesel generators 11 and I the ;above requir.ed A.C.

electrical power sources inop able, demonstrate the OPERABILITY 6f the remaining A.C. sources perform' g Surveillance Requirements 4.8.1.1,1.a within one ho and 4.8.1.n.a.4, within two hours and at least once per 8 hou; thereafter; res re at least. one of the in-operable diesel gener ors 11 and 12 to OP BLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in at least H SHUTDOWN within the ne 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within t following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

Resto both diesel genera-tors'll and 12 OPERABLE status within 72. hour from time of initial less or be in t least HOT SHUTDOWN within the nex 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTD0 within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

f.

With di el generator 13 of the above required A.C. elec ica) power sourc inoperable, demonstrate the OPERABillTY of the rem 'ning A.C. sources by performing Surveillance Requirements 4.8.1.1..a in one hour and 4.8.1.1.2.a.4, for one diesel generator at w

1 me, within two hours and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter; restore the inoperable diesel generator 13 to OPERABLE status with 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or declare the HPCS sy. stem inoperable and take the ACTION

\\

rquir d by43:ific;thr.M L

^ Specification 4.8.1.1.2.a.4 must be performed for diesel generator 13 only w'nen the HPCS system is OPERABLE.

GRAND GULF-UNIT 1 3/4 8-2 A%b..ca No.

Insert for Technical Specification Page 3/4 8-2 ACTION'(continued) c.

With one offsite circuit and diesel generator 11 or 12 of the above required A.C. electrical power sources inoperable, demonstrate the OPERABIllTY of the remaining A.C. sources by performing Surveillance Requirement 4.8.1.1.1.a within I hour and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter. Demonstrate the OPERABILITY of the remaining OPERABLE diesel generators, for one diesel generator at a time, by performing Surveillance Requirement 4.8.1.1.2.a.4* within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .

Restore at least one of the inoperable A.C. sources to OPERABLE status within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or be in at least H0T SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

d.

With either diesel generator 11 or 12 of the above required A.C.

electrical power sourcer inoperable, in addition to ACTION b, c, or i, as applicable, verifi within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months that all required systems, subsystems, trains, components and devices that depend on the remaining OPERABLE diesel generator 11 or 12 as a source of emergency pcwer are also OPERABLE; otherwise, be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

e.

With both of the above required offsite circuits inoperable, demon-strate the OPERABILITY of the three required diesel generators, by performing Surveillance Requirement 4.8.1.1.2.a.4* for one diesel generator at a time within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months unless the diesel generators are already operating. Restore at least one of the above required offsite circuits to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

f.

With diesel generators 11 and 12 of the above required A.C.

electrical power sources inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveillance Requirement 4.8.1.1.1.a_ within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter and Surveillance Requirement 4.8.1.1.2.a.4* for diesel generator 13 within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months . Restore at least one of the inoperable diesel generators 11 or 12 to OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or be in at least H0T SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , g.

With diesel generator 13 of the above required A. C. electrical power sources inoperable, demonstrate the OPERABILITY of the offsite A.C.

sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter. Restore diesel generator 13 to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or declare the HPCS system inoperable and take the ACTION required by Specification 3.5.1.

J16ATTC86050801 - 2 i

i

Insert for Technical Specification Page 3/4 8-2 (continued)

ACTION (Continued) h.

With one offsite circuit of the above required A. C. electrical power sources inoperable and diesel generator 13 inoperable, demonstrate the OPERABILITY of the remaining A.C. sources by performing Surveillance Requirement 4.8.1.1.1.a within I hour and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter.

If diesel generators 11 or 12 have not been successfully tested within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months prior to entry into this ACTION statement, demonstrate OPERABILITY by performing Surveillance Requirement 4.8.1.1.2.a.4 for one diesel generator at a time, within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

Restore the offsite circuit and diesel generator 13 to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or declare.the HPCS system inoperable and take the ACTION required by Specification 3.5.1 and be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD l

SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

1.

With either diesel generator 11 or 12 inoperable and diesel generator 13 inoperable, demonstrate the OPERABILITY of the above required A.C. offsite sources by performing Surveillance Requirement 4.8.1.1.1.a within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months and at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months thereafter.

If either of the inoperable diesel generators is inoperable as a result of any cause other than preplanned preventative maintenance or testing, demonstrate the OPERABILITY of the remaining OPERABLE diesel generator by performing Surveillance Requirement 4.8.1.1.2.a.4 within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . Restore the inoperable diesel generator 11 or 12 and diesel generator 13 to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or declare the HPCS system inoperable and take the ACTION required by Specification 3.5.1 and be in at least HOT SHUTD0WN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

J16ATTC86050801 - 3

ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS 4.8.1.1.1 Each of the above required independent circuits between the offsite transmission network and the onsite Class 1E distribution system shall be:

Determined OPERABLE at least once per 7 days by verifying correct a.

breaker alignments and indicated power availability, and b.

Demonstrated OPERABLE at least once per 18 months during shutdown by manually transferring unit power supply from the normal circuit to the alternate circuit.

4.8.1.1.2 Each of the above required diesel generators shall be demonstrated OPERABLE:

a.

In accordance with the frequency specified in Table 4.8.1.1.2-1 on a STAGGERED TEST BASIS by:

1.

Verifyi ig the fuel level in the day tank.

2.

Verifying the fuel level in the fuel storage tank.

3.

Verifyino the fuel transfer pump starts and transfers fuel from the storoge system to the day tank.

4.* Verifyingthedieselstartsfromb t condition and accelerates l

to at least 441 rpm for diesel generators 11 and 12 and 882 rpm for diesel generator 13 in less than or equal to 10 seconds.

The generator voltage and frequency shall be 4160 416 volts and 60 1 1.2 Hz within 10 seconds after the start signal.

The diesel generator shall be started for this test by using one of the following signals:

a)

Manual.

b)

Simulated loss of offsite power by itself.

c)

Simulated loss of offsite power in conjunction with an ESF actuation test signal.

d)

An ESF actuation test signal by itself.

5.M Verifying the diesel generator is synchronized, loaded to greater.

3 than or equal to 5450 kW but not to exceed 5740 kW for diesel generators 11 and 12 and 3300 kW for diesel generator 13 in less than or equal to 60 seconds, and operates with these loads for at least 60 minutes.

6.

Verifying the diesel generator is aligned to provide standby power to the associated emergency busses.

7.

Verifying the pressure in all diesel generator air start redeivers to be greater than or equal to:

a) 160 psig for diesel generators 11 an9 12, and*

b) 175 psig for diesel generator L3.

b.

At least once per 31 days and after each operation of the diesel where the period of operation was greater than or equal to 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months by checking for and removing accumulated water from the day fuel tanks.

ENSERT G AND GULF-UNIT 1 3/4 8-3 AnwaMememT~ M-i

Insert for Technical Specification Page 3/4 8-3

All diesel Generator starts for the purpose of this Surveillance Requirement The diesel generator start-(10 may)be preceded by an engine prelube period.from standby conditions shall be perfo sec these surveillance tests. All other engine starts for the purpose of this

. surveillance testing may be preceded by warmup procedures as recommended by the manufacturer so that the mechanical stress and wear on the diesel engine is minimized.

The diesel generator loading (60 sec) shall be performed at least once per 184 days in these' surveillance tests. All other diesel engine runs for the purpose of this surveillance testing may include gradual loading as recommended by the manufacturer so that the mechanical stress and wear on the diesel engine is minimized.

l J16ATTC86050801 - 4

TABLE 4.8.1.1.2-1 DIESEL GENERATOR TEST SCHEDULE INSEAT

^

ui Fasiusca in humuci100 Valid Tests

Test Frequency

< 1 At least once p 31 days 2

At least ce per 14 days 3

A east once per 7 days

>4 At least once per 3 days

Criteria for determi g number of failu and number of valid test shall be in cordance with Regulatory sition C.2.e of Regulatory Gu' 1.108, Revision 1, August 197,

here the last 100 tests determined on a per nuclear unit bas For the purpos of this test schedule, only valid tests cond ed after the issuance date shall be included in the computation the

" ast 100 valid tests." Entry into this test schedule shall

d at the 21 day tect 'requency.

?

GRAND GULF-t, 1

3/4 8-8 be M"T m

Insert for Technical Specification Page 3/4 8-8 Number of Failures in Number of Failures in Last 20 Valid Tests

Last 100 Valid Tests

Test Frequency

. $L 1

$L 4 Once per 31' days 3> 1

- 4 Once per 7 days

Criteria for determining number of failures and number of valid tests shall be in accordance with Regulatory Position C.2.e of Regulatory Guide 1.108, Revision 1, August-1977 with exceptions as noted in the FSAR, but determined on a per diesel generator basis.

For the purposes of this test schedule, only valid tests conducted after the OL issuance date shall be included in the computation of the "last 100 valid tests".

For the purpose of determining the required test frequency, the previous test fail 0re count may be reduced to zero if a major diesel overhaul is completed, provided that the overhaul, including appropriate post-maintenance operation and testing, is specifically approved by the manufacturer and if acceptable reliability has been demonstrated and accepted by the NRC.

l l

l J16ATTC86050801 - 5 l

1

~

ELECTRICAL POWER SYSTEMS BASES

~

A.C. SOURCES, D.C. SOURCES and ONSITE POWER DISfRIBUTION SYSTEMS (Continued) restricted as noted in a letter from E. G. Adensam*to L. F. Dale, dated 17 July 1984.

The SSW pump load values are not used as the largest single load rejected from the diesel generators when testing to meet the requirements of Regulatory Guide 1.9.

Since the SSW system supplies cooling water to its associated diesel generator, tripping the SSW pump to perform this test would result in loss of the diesel generator.

An exception is taken with respect to Regulatory Guide 1.108 requirements on the surveillance test frequency for the diesel generators in relationship to the number of valid failures. The test frequency provided in Table 4.8.1.1.2-1 provides adequate assurance of diesel generator availability without causing degradation due to excessive engine starts.

The determination of valid failures on a per diesel type basis reflects that failures on diesel generators 11 or 12 manufactured by Transamerica Delaval do not necessarily reflect the same problem on diesel generator 13 manufactured by Electromotive Division of General Motors.

l GRAND GULF-UNIT 1 8 3/4 8-la Amendment No. _

t h.nf ib5GN BAXTEk NAf BRASWELL %4/

FRANKLIN FUTURE o

a o

n 4

1 I SKV I

u o

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J5222 J5288 J5242 J524G f

50CKV EAST bus TUR8INE l 22KV GE NER AT OR Bult.0IN uAIN Wy J5242 J5224 J5236

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No 2 T M xF u4 22KV/500AV e

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.,_ _ _ _ J NOTES

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J5209 J5221 J5233 J5245 8.

DISC 0rer.ECT tsF Xf a 15kV/4 4 6nv ~

J5208 J5220 J5232 J5244 fi$CUiT BEE AnER J5207 J5249 J5231 J5243 OiScot.NECT J5230 0

O-J5206 o

500KV/

, J5229 J5244 2,

5xx-xxxX -

J5205 J5287 G3NPS OES1 GNAT 80N SERvlCE QW ggxxxyg.

50uKV/

SERVICE Q MSJ OESIGNATiON AF uR J5204 J5216 X

p,F MR J5228 J5240 No 21 34SkV yg JI65:

J5203 J5215 Jt655 J5227 J5239 Ma 7

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No. I 22KV l

552-2405 JI652 500KV' WEST 8U3 I

Cl GMERATOA l

J4656 552-8405 l

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lJn653 34 5KV BUS 21R JI657 OK 34 5KV BUS _ I IR l

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569-2404A 589-210 l a 589-2 0 02A 589-2103A T O N ADI AL WEL L

[ TURBINE 8UILO4NG l UNIT I 589-i l 0 3A 589-il02A 589-a l0 8 A 5 8 9-1 104 A (J i 6 6 tl (J 16 8 5)

(J t 6031 (JI6071 SWITCHGEAR (J I 63 51 IJ I 627)

(J i 639)

(J I 63 tl J

552-2604 552-2404 552-2602 552-2l03 BDP BOP 552-8803 552-1802 552-8808 552-1804 (J I 6 6 28 (J 16161 (J t 6041 (J 4 608)

XF MR XF MN (J 1636)

(J i 628J (J I 6403 (J I 6321 589-20048 589-2l018 589-2 4 02B 589-26038 5 89-i t 038 589-16028 589-18018 9

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v t e Letter Sequence Other
TAC:55863, (Approved, Closed)
Initiation Request, Request, Request Acceptance... Administration Questions Answers Results Approval, Approval, Approval Other: AECM-84-0473, Forwards Response to Generic Ltr 84-15 Re Proposed Actions to Improve & Maintain Diesel Generator Reliability.Comments & Recommendation Encl, ML20195C918, ML20205Q935, ML20209H104, ML20215C522
MONTHYEAR1986-12-09 [Table View]

ML20195C918

Text

SUBJECT:

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