ML20011A115
| ML20011A115 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 09/30/1981 |
| From: | BOSTON EDISON CO. |
| To: | |
| Shared Package | |
| ML20011A113 | List: |
| References | |
| NUDOCS 8110070277 | |
| Download: ML20011A115 (6) | |
Text
3.7.B Standby Gas TreatmentI tem and 4.7.B Standby is Treatment System and Control Room With Ef tiuency Air Contro1%oom High Efficiency Air Filtration System Filtration System 1.
Standby Gas Treatment System 1.
Standby Gas Treatment Sys' tem a.
Except as specified in
- a. (1.) At least once every 18 3.7.B.1.c below, both trains months, it shall be of the standby gas treatment demonstrated that pressure system and the diesel genera-drop across the combined tors required for operation of high efficiency filters such trains shall be operable and charcoal adsorber canks at all times when secondary is less than 8 inches of containment integrity is water at 4000 cfm.
required or the reactor shall be shutdown.in 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />..
(2.) At least once every 18 months, demonstrate b.
(1.) The results of the in-that the inlet heaters place cold DOP tests on HEPA filters shall show on each train are operable and are capable
>99% DOP removal. The of an output of at least results of halogenated 14 kW. Perfom an hydrocarbcr. tests on instrument functional j
charcoal adsorber banks test on the humidistats shall show > 99% halogenat-controlling the heaters.
ed hydrocarbon removal.
(3.) The tests and analysis of (2.) The results of the Specificatior 3.7.B.1.b.2 laboratory carbon sample shall be perforned at least analysis shall show >95%
once every 18 months or methyl iodide removaT at following painting, fire a velocity within 10% of or chemical release in any system design, 0.5 to ventilation zone ccmmunicat-1.5 mg/m3 inlet methyl ing with the system while, iodide concentration, the system is operating that
->70% R.H. and >1900F.
could contaminate the HEPA
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f'11~ters or charcoal adsorbers.
I
- c.
From and after the date that one train of the Standby Gas (4.) At least once every 18 Treatment System is made or months, automatic 1
found to be inoperable for initiation of each branch any reason, continued I
of the standby gas reactor operation or fuel V treatment system shall l
handling is permissible only be demonstrated, with during the succeeding seven Specifica'. ion 3.7, B.1.d days providing that within satisfied.
2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and daily thereafter, all active components of the (5.) Each train of the standby other standby gas treatment gas treatment system shall train shall be demonstrated be operated for at least to be operable.
15 minutes per month.
l d.
Fans shall operate within (6.) The tests and analysis of l
+10% of 4000 cfm.
Specification 3.7.B.1.b.(2)
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shall be performed after i
every 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of system l
operation.
- Conditional Relief granted from this LC0 for the period October 3 158 l
through October 19, 1981.
t 8110070277 810930 PDRADOCK05000g P
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T 3.7.B (Continued) 4.7.B (Conw-oued)
- e.
Except ns specified in
- b. (1.) Inplace cold DOP testing 3.7.B.1.c. both trains of shall be perfcrmed on the the standby gas treatment HEPA filters after each system shall be operable completed or partial during fuel handling replacement of the HEPA operations.
If the filter' bank and after any system is not operable structural maintenance on fuel movement shall not the HEPA filter system be started (any fuel housing which could affect assembly movement in the HEPA filter bank progress may be completed).
bypass leakage.
(2.) Halogenated hydrocarbon testing shall be performed on the charcoal adsorber bank after each partial or complete replacement of the charcoal adsorber bank or after any struc-tural maintenance on the charcoal adsorber housing which could affect the charcoal adsorber bank bypass leakage.
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- Conditional Relief granted from this LC0 for the period October 3 through October 19, 1981 1
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T 3.7.8, (Continued) 4.7.B (Con; u2d) 2.
Control Room High Efficiency Air 2.
Control Room High Efficiency Air Filtration System Filtration System
- a.
Except as specified in a.
At least once every 18 Specification 3.7.B.2.c months the pressure drop below, both trains of the across each. combined filter Control Room High Efficiency train shall be demonstrated Air Filtration System used to be less than 3 inches of for the processing of inlet water at 1000 cfm.
air to the control room under accident conditions and the b.
(1.) The tests and analysis of.
diesel generator (s) required Specification 3.7.B.2.b for operation of each shall be performed once train of the system shall every 18 months or be operable whenever secondary following painting, fire containment integrity is or chemical release in required and during fuel any ventilation zone handling operations.
comunicating with the system while the system b.
(1.) The results of the in-is operating.
place cold DOP tests on H
lters shall ow (2.) Inplace cold 00P testing results of the halogenat-shall be performed after ed hydrocarbon tests on each complete or partial charcoal adsorber banks replacement of the HEPA shall show >99% halogenat-filter bank or after any ed hydrocarFon removal structural maintenance when test results are on the system housing extrapolated to the which could affect the initiation of the test.
HEPA filter bank bypass leakage.
(2.) The results of the laboratcry carbon sample (3.) Halogenated hydrocarbon analysis shall show >95%
testing shall be performed methyl iodide removaT at after each complete or a velocity within 10% of partial replacement of system design, 0.05 to the charcoal adsorber 0.15 mg/m3 inlet methyl bank or after any iodide concentration, structural maintenance
>70% R.H., and >1250F.
on the system housing which could affect the
- c.
From and after the date that charcoal adsorber bank one train of the Control Room bypass leakage.
High Efficiency Air Filtration System is made er found to be (4.) Each train shall be incapable of supplying filtered Operated with the heaters air to the control room for any in automatic for at least reason, reactor operation or.
15 minutes every month, refueling operations are permissible only during the (5.) The test and analysis of succeeding 7 days.
If the Specification 3.7.B.2.b. (2,.
system is not made fully oper-shall be perfomed after able within 7 days, reactor every 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of system operation.
- Conditional Relief granted.from this LC0 for the period October 3 15BB through October 19,198J.
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,, 3.7,5 (Continued) 4.7.8 (Continueo) shutdown shall be c.
At least once every 18 mor.ths initiated and the reactor the following shall be shall be in cold shutdown demonstrated:
r within the next 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> and irradiated fuel handling (1) Automatic initiation of operations shall be terminated the control room high within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.
(Fuel handl-efficiency air filtration ing operations in progress system.
may be completed).
(2) Operability of heaters d.
Fans shall operate within at rated power.
+ lot of 1000 cfm.
3.
Perform an instrument functional test on the humidistate controlling the heaters.
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ATTACHMENT B SAFETY EVALUATION FOR TECHNICAL SPECIFICATION CHANGE ON THE STANDBY GAS TREATMENT SYSTEM AND THE CONTROL ROOM HIGH EFFICIENCY AIR FILTRATION SYSTEM l
i Pursuant to Section 50.59 of the Comission's Rules and Regulations, Boston Edison l
has perfomed a safety evaluation of the proposed chylge to Appendix A of Operat-ing License No. DPR-35.
The followir3 areas of concern were addressed in the parformance of the safety evaluation:
Components Which Require Power Restoration In The Event Of Failure Of Block Wall 212.1 c
Five (5) safety related systems were identified that would not maintain their intended design function during design based events; specifically, Standby Gas Treatment (SGTS) - Train A (Power)
Control Room Ventilation - Train A (Power)
Residual Heat Removal - Train A Reactor Core Isolation Cooling Standby Liquid Control - Tank Heater By utilizing Ap endix G, Station Nuclear Safety Operational Analysis, of the PNPS I FSAR, only two 2) of the five (5) systems; namely, Control Room Ventilation and Standby Gas Treatment, were found to be required in the cold shutdown and the refueling modes.
Probability Estimate of Fuel Handling Accident in Conjunction with Block Wall Failure l
The probability of a fuel handling accident due to random failure coincident with block wall failure was not calculated, as it would reasonably be several orders of magnitude below the probability of comon cause failures.
The total probability, P, of a fuel handling accident at the same time as block T
wall failure is:
T P(block wall failure caused by tornado) + P (block wall failure due to earth-P
=
while handling fuel quake while handling fuel)
= 8.2 x 10-6/ refueling + 2 x 10-6/ refueling = 1.0 x 10-5/ refueling The PB0C event is not considered to be a threat, based on the fact that the reactor plant is shutdown, cooled down, depressurized and open to the atmosphere.
Radiological Offsite Effects of A Refueling Accident Assuming The SGTS Is Inoperable The design based Fuel Handling Accident was analyzed assuming that the SGTS is in-operable.
f This analyses is consistent with the PNPS-1 Safety Evaluation Report with the excep-tion of certain methods and assumptions recommended in Safety Guide 25 and Regulatory Guide 1.145 which are more recent than the SER.
e 2-The results of this analyses indicate that the offsite thyroid dose which would result from a fuel drop at or after 120 hours0.00139 days <br />0.0333 hours <br />1.984127e-4 weeks <br />4.566e-5 months <br /> after shutdown with the SGTS inoperable would result in a site boundary dose of about 32 Rem to the thyroid and less than 1 Rem to the whole body or skin. The values are approximately 10%
(or less) of the applicable 10CFR100 limits. Therefore, the SGTS would not be required to limit offsite doses resulting from a Fuel Handling Accident, previded fuel movement occurs later than 120 hours0.00139 days <br />0.0333 hours <br />1.984127e-4 weeks <br />4.566e-5 months <br /> after reactor shutdown.
Based on the above results, in conjunction with the interim operating measures delineated in attached BECo. Letter #81-230, the proposed change does not con-stitute an unreviewed safety question and, consequently, there is reasonable assurance that the public he61th and safety will not be endangered.
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