ML20154J755
| ML20154J755 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 03/06/1986 |
| From: | PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | |
| Shared Package | |
| ML20154J750 | List: |
| References | |
| PROC-860306, SBN-962, NUDOCS 8603110042 | |
| Download: ML20154J755 (8) | |
Text
I SBN-962 Attachment A Revision to Section 5.0 Seabrook Station Radiological Emergency Plan 31 g
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SB 1 & 2 Amendment SS FSAR July 1985 Figure 5.6 presents the critical safety functions in descending order of importance as one reads down the figure.
If more than one classification is reached, the emergency will be classified according to the most severe.
5.5 Miscellaneous Station Conditions The capability also exists for the classification of emergencies based on conditions that do not challenge a Critical Safety Function.
Based on the guidance of Appendix 1 of NUREG-0654/FEHA-REP-1, miscellaneous emergency conditions (e.g.,
fire, electrical, security, natural events) have been evaluated, initiating conditions identified and Emergency Action Levels developed. The specific miscellaneous initiating conditions are indicated on Figure 5.6.
In some cases a combination of miscellaneous conditions or a complication of a miscellaneous condition with a critical safety function are an indication that an emergency classification has been reached.
These combinations and compli-cations are also on Figure 5.6.
5.6 Classification of Emergencie(
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Classification of an emergency at Seabrook Station is made based on one or more of the conditions listed in Figure 5.6.
Specific EAL's (color status trees, meter indications, alarms, or limits) for initiating conditions are provided in an emergency response procedure and in operator training.
In all cases, if several emergency classifications are indicated, the most severe emergency classification will be made whether based upon status trees or miscellaneous initiating conditions.
5.7 Sample Classifications To ensure understaaJiug of the emergency classification system, the following sample classifications are presented. These examples explain the process by which the operators would come to the decision to classify an emergency.
EXAMPLE 1 - Condition - Critical Safety Function Core Cooling (Figure 5.2) indicates orange.
First locate C, Core Cooling under the Critical Safety Function column on the left of Figure 5.6.
Then moving to the right, find C Orange under the appropriate emergency class, Site Area Emergency.
EXAMPLE 2 - Condition - Critical Safety Functions, Heat Sink (Figure 5.3) indicates red, and Core Cooling (Figure 5.2) indicates orange.
Combinations of separate Critical Safety Function indicators sometimes warrant a higher level emergency classification. First locate C, Core Cooling under the Critical Safety Function column on Figure 5.6.
Moving to the right, find C Orange (Site Area Emergency), then C Orange plus H Red (Cencral Emer-(
gency). Then locate H, Heat Sink. Moving to the right, find H Red (Site Area Energency).
Using the most severe classification, select Cencral Emergency.
5-3
n-Insert " A" onto p. 5-3 The specific emergency response procedure is ER-1.1 " Classification of Emergencies". his procedure contains the specific EAL's that serve as the basis for an emergency condition classification into one of the four emergency categories.
Bis. includes specific defin-itions of the events (i.e. natural phenomena, man-made occur rences, security threats and discretionary it ems) under category 18 of Fig-ure 5 6.
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Cold A,3 TEuPeriATURE RED ALL RCS PRESSURE N
COLD LEG TEMPERATURE POINTS TO Y
RIGHT OF LIMIT A ALL RCS N
COLD LEG TEMPERATURES GREATER THAN y
250* F (T )i YELLOW TEMPERATURE
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N DECREASEIN N
CO D EG ALL COLD LEGS TEMPERATURES LESS TH AN 100* F GREATER THAN IN THE LAST Y
Y 280* F (T )
2 60 MIN GREEN ORANGE ALL RCS COLD LEG N
TEMPERATURES GREATER THAN Y
250* F (T )
3 YELLOW N
PRESSURE LESS THAN b- ?._
Y nascanimr RCS N
TEMPERATURE GREATER THAN GREEN 350*F $
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FIGURE 5.4 1
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RED TOTAL FEEDWATER
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ALL SGs Y
YELLOW N
PRESSURE LESS CONTAINMENT BUILDING N
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LEVELS GREATER THAN 28% IN ALL SGs Y
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m PE168 PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE EMERGENCY CLASSIFICATION SEABROOK STATION - UNITS 1 & 2 FLOW CHART RADIOLOGICAL EMERGENCY PLAN g-l '/ g 4
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FINAL SAFETY ANALYSIS REPORT l
FIGURE 5.6 -
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SBN-962 Attachmsnt B 1
Additional Clarification l
1.
NUREG-0654, Appendix 1, pg. 1-5, Example 1( ECCS initiated and dis-charged to Vessel) 1 Item 14b of the Seabrook Station classification system requires the operator to verify that any ECCS activation event is not inadvertent.
Verified and validated emergency response procedures E.O. and ES-1.1 i
provide positive assurance that any such actuation has not been ini-tiated due to an actual condition.
If such actuation is in response l
to an actual event or, if conditions allowing termination cannot be I
achieved, then the declaration of an Unusual Event is required by procedure ER-1.1.
2.
NUREG-0654, Appendix 1, pg. 1-13, Example 1 (Known LOCA greater than I
makeup pump capacity)
Item 15b of the Seabrook Station classification system conservatively satisfies a loss of coolant greater than make'up pump capacity.
If leakage is greater than the capacity of one of two available makeup pumps, the operator is directed to trip the plant and initiate safety inj ect ion.
These actions will result in entry into Procedure E-1, which constitutes a Site Area Emergency.
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3.
NUREG-0654, Appendix 1, pg. 1-18, Example PWR Sequences We have reviewed these examples against the events incorporated as General Emergencies in the Seabrook Station classification system l
and have concluded that the desire of early identification of these types of conditions is met with our classification system.
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