ML19319D914
| ML19319D914 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 02/09/1977 |
| From: | SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | |
| Shared Package | |
| ML19319D908 | List: |
| References | |
| NUDOCS 8003270583 | |
| Download: ML19319D914 (7) | |
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RANCHO SECO UNIT 1 TECHNICAL SPECIFICATIONS Surveillance Standards 4.10 EMERGENCY CONTROL ROOM FILTERING SYSTEM Applicability Applies to the emergency control room filtering sys tem components.
Objective To verify that these systems and components will be able to perform thei r design functions.
Surveillance Requirements 4.10.1 The Control Room Emergency Ventilation System shall be:
a.
Demonstrated operable at least once per quarter by initiating flow through the ventilation / cooling system and demonstrating that the outside air makeup system flow is 40 cfm f; 20 percent.
b.
Demonstrated operable at least once per refueling interval, or (1) af ter any structural maintenance on the HEPA filter or charcoal adsorber housings, or (2) following painting, fire or chemical release in the operating air makeup system, by:
1.
Verifying that the charcoal adsorbers remove 3,99 percent of a halogenated hydrocarbon refrigerant test gas when they are tested in place in accordance with ANSI H510-1975 while operating the filter train at a flow rate of 40 cfm f; 20 pe rcent.
2.
Verifying that the HEPA filter banks remove 2.99 percent of the DOP when they are tested in place in accordance with ANSI H510-1975 while operating the filter train at a flow rate of 40 cfm j-20 percent.
3 Verifying within 31 days af ter removal that a laboratory analysis of a carbon sample f rom ei ther at least one test canister or carbon sample removed f rom one of the charcoal 1
adsorbers demons trates a removal ef ficiency of 2,90% foi radioactive methyl iodide when the sample is tested in accordance wi th ANSI H510-1975 (25*C, 70% R.H.).
The carbon samples not'obtained from test canisters shall be prepared by either:
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(a)
Emptying one enti re bed from a removed adsorber tray, mixing the adsorbent thoroughly, and obtaining sam-ples at least two inches in diameter anc with a length
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equal to the thickness of the. bed.
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Surveillance Requirements (Continued)
(b)-
Emptying a longitudinal sample from an adsorber tray, mixing the adsorbent thoroughly, and obtaining sam-l plcs at least two inches in diameter and with a length equal to the thickness of the bed.
4.
Verifying that the pressure drop across the combined HEPA filters, and charcoal adsorber banks is <6 inches Water Gauge while operating the ventilation makeup system at a flow rate of_40 cfm + 20 percent.
5 Verifying that on a high radiation signal, the normal system 4
automatically is isolated and that the Emergency System operates.
6.
Verify the air makeup system maintains the room at a posi-tive pressure of >.005 inches W.C.
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relative to the outside atmosphere with a flow of 40 cfm + 20 percent.
c.
Following original Installation, modification, or major repair of the system, verify that the air flow distribution across the filter bank is uniform in accordance with ANSI N510-1975 Bases The purpose of the emergency control room filtering system is to, limit the particulate and gaseous fission products to which the control room area would be subjected during an accidental radioactive release in or near the Auxiliary Building.
The system is designed with a filter train which consists of a prefilter and charcoal filter ahead.of a high ef ficiency particulate filter, and charcoal filter with a booster fan to pressurize the control room with outside air.
Since this system is not normally operated, a periodic test is required to insurc its operability when needed.
Quarterly test ing of this system will show that the system-is available for its safety action.
During this test the system will be inspected-for such things as. water, oil, or other foreign material; gasket deterioration, adhesive deterioration in the HEPA filter; and unusual or excessive noise or. vibration when the fan motors are running.
The. flow of 40 cfm was selected-to limit the maximum radiation dose to
' occupants of the control room in an accident.
For.this analysis, both char-coal ~ filter banks were assumed to provide DF's of '10, while the HEPA filter i
DF is. assumed to be 100.
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Refueling interval testing will verify the methyl iodide removal efficiency of the charcoal' and the amount of leakage past the charcoal and absolute filters.
- The system is automatically started, and the normal system isolated, when the
' radiation level in the control room increases, or n.anually whenever desired
.by the operator.
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RANCHO SECO UNIT 1 TECHNICAL SPECIFICATIONS Surveillance Standards 4.11 AUXILIARY AND SPENT FUEL BUILDING FILTER SYSTEtiS Applicability Applies to the Auxiliary Building exhaust filter sys tem and to the Spent Fuel Pool Building when irradiated fuel is being noved or is being stored in it.
Obj ect ive To verify that the Auxiliary Building exhaust fil ter sys tem and components will be able to perform their design functions.
Surveillance Requirements 4.11.1 When irradiated fuel which has decayed less than 90 days is in the spent fuel storage pool:
a.
The spent fuel storage pool building ventilation system shall be verl fled to be operating with all spent fuel building doors closed (excepting intermittent personnel use) prior to fuel movement and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> during either fuel movement within the spent fuel storage pool or crane opera-tion with loads over the spent fuel stcrage pool.
4.11.2 Proper OPERATION of ventilation system shall be verified:
a.
At least once per mon th by observing flow through the operating HEPA filter and charcoal adsorber train and verifying that the train operates with <6 inches Water Gauge pressure drop across the combined HEPA and Charcoal filter banks.
b.
At least once per refueling interval or (1) a f ter any struc-tural maintenance on the HEPA fil ter or charcoal adsorber hous-ings, or (2) following painting, fire or chemical release in any ventilation zone communicating with the opercting system, by:
1.
Verifying that the charcoal adsorbers remove 199 percent of a halogenated hydrocarbon refrigerant test gas when they are tested in place in accordance with ANSI N510-1975 whlle operating the filter train at a flow rate of 43,t00 cfm _+ 10 percent.
2.
Verifying that the HEPA filter banks remove >992 of the DOP when they are tested in place in accordance Uith ANSI N510-1975 while operating the filter train at a flow rate of h3,400 cfm + 10%.
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3 Verifying that with the Auxiliary Building exhaust system operating at a flow rate of 43,400 cfm j; 10 percent and exhausting through the HEPA filters and charcoal adsorbers, to the facility vent, provides 10,800 cfm j; 10 percent exhaust from the spent fuel pool area.
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Verifying within 31 days af ter removal that a laboratory analysis of a carbon sample from at least one test canister or carbon sampic removed from one of the charcoal adsorbers demonstrate, a removal ef ficiency of >90% for radioactive i
methyl iodide when the sample is tested in accordance with ANSI N510-1975 (25*C, 70% R.H.).
The carbon samples not obtained from test canisters shall be prepared by either:
(a)
Emptying one entire bed f rom a removed adsorber t ray,
mixing the adsorbent thoroughly, and obtaining sam-pies at least two inches in diameter and with a length equal to the thickness of the bed.
(b)
Emptying a longitudinal sample f rom an adsorber tray, mixing the adsorbent thoroughly, and obtaining sam-pies at least two inches in diameter and with a length equal to the thickness of the bed.
.c.
Verify that the air distribution across the adsorber section is uniform, per ANSI N510-1975, followin9 original Installation, modi fication, or major repai r.
Bases j
'The-Auxiliary Building exhaust system consists of two full capacity units I
arranged to take suction from a common plenum, draw the air through HEPA and Charcoal-Filter banks and discharge it into the plant vent.
Only one unit is operated at a time, allowing the other to be serviced or held in re se rve.
This system. draws all of the potentially radioactively contaminated air in the plant, external to the Reactor Building, through it.
The following
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major areas are served:
1)
Spent Fuel Building 4
2)-
Radio-Chemical Lab Hoods and Service Area 1
3)
'Radwaste Area 4)
Gland Steam Exhaust l
5)
Waste Gas! Discharge 6)
Condenser Air Ejector Exhaust
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Various Instrumentation and Sampling Discharges 4-42a
As a consequence of providing service to these areas the filters provide a DF of 10 for radioactive icdine and a DF of 100 for particulate matter which may be released in the following assumed accidents:
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Letdown Line rupture outside the Reactor Building L)
Post LOCA Decay Heat Removal Leakage 3)
Dropped Fuel Assembly in Spent Fuel Pool 4)
OTSG Tube rupture Inplace Leakage testing of the filters demonstrates their integrity and the DF of the HEPA bank.
The laboratory testing of charccal will demon s t ra t e the suitability for a bank to remain in service as well as provide an estimate of its remaining service life.
The testing required af ter painting, fire or chemical release, is not to be interpreted to include minor touch-up painting, lighted cigarettes, house keeping chemicals and detergents, or other similar activities common to the normal routine.
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RANCHO SECO UNIT 1 TECHNICAL SPECIFICATIONS Surveillance Standards 4.12 REACTOR BUILDING EMEnGENCY FILTERING SYSTEM Applicability Applies to testing Ree tor Building emergency filters.
Objective To verify that the Reactor Building emergency filters will perform their de-sign function.
Surveillance Requirements 4.12.1 The Reactor Building Emergency Filtering system shall be deron-strated OPERABLE:
OPERABILITY of the fans and associated cooling equipment is a.
demonstrated in Technical Specification h.5.2.
b.
At least once per refueling interval or (1) af ter any struc-tural maintenance on the charcoal adsorber housings, or (2) following painting, fire or chemical release in any ventila-tion zone communicating with the operating system, by:
(1)
Verifying within 31 days af ter removal that a laboratory analysis of a carbon sarale from either at least one test canister or carbon sampic removed f rom one of the char-coal adsorbers demonstrates a removal efficiency of 385%
for radioactive methyl iodide when the sample is tested in accordance with ANSI H510-1975 (130 C, 95? R H.).
The carbon samples not obtained from test canisters shall be prepared by either:
(a)
Emptying one enti re bed f rom a removed adsorber tray, mixing the adsorbent thorough ly, and obta in ing sam-plcs at least two inches in diancter and with a length equal to the thickness of the bed.
(b)
Emptying a longitudinal sample from an adsorber tray, mixing the adsorbent thoroughly, and obtain-ing samples at least two inches in diancter and with a length equal to the thickness of the bed.
(2)
Verifying a filter train flow rate of 40,000 cfm 1,10 percen t during sys tem opera t ion of when tested in accordance with ANSI N510-1975 4-43
Surveillance Requirements (Continued) c.
Verify that the air distribution across the adsorber section is uniform, per ANSI N510-1975, following original installation, modification, or maior repair.
Bases The Reactor Building emergency fil ters are charcoal adsorbers used in the post LOCA atmosphere to remove iodine from the Containment.
In this appli-cation credit was taken for 85% iodine removal efficiency.
Inplace fil ter leakage tes ting, wi th ref rigerant gas, is not requi red for recirculating systems located within reactor containment as long as the adsorbent is sampled and tested per ANSI H510-1975, as described above.
Operability is adequately demonstrated in Technical Specification 4.5.2.
The testing required after painting, fire or chemical release, is not to be interpreted to include minor touch up painting, lighted cigarettes, house keeping chenicals and detergents, or other similar activities common to the normal rout ine.
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