ML18046A805

Forwards Comments on NRC 800711 Draft Evaluation of SEP Topic VIII-3.B & Subsequent 810526 Safety Evaluation. Disagreement Expressed Re NRC Contention That Addl Control Room Displays & Annunciators Are Needed

ML18046A805
Person / Time
Site:	Palisades
Issue date:	07/14/1981
From:	VINCENT R A CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	CRUTCHFIELD D Office of Nuclear Reactor Regulation
References
TASK-08-03.B, TASK-8-3.B, TASK-RR NUDOCS 8107220108
Download: ML18046A805 (12)

Text

,. .. consumers Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201 * (517) 788-0550 July 14, 1981 Director, Nuclear Reactor Regulation Att Mr Dennis M Crutchfield, Chief Operating Reactors Branch No 5 US Nuclear Regulatory Commission Washington, DC 20555 DOCIIBT 50-255 -LICENSE DPR-20 -PALISADES PLANT -SEP TOPIC VIII-3.B, DC POWER SYSTEM BUS VOLTAGE MONITORING AND ANNUNCIATION 0 By letter dated July 11, 1980, the NRC transmitted for comment a draft evaluation of SEP Topic VIII-3.B for the Palisades Plant. Subsequent letter dated May 26, 1981 provided the staff safety evaluation for this topic. Consumers Power Company has completed its review of these documents.

In general, we disagree with the staff's contention that additional control room displays and .annunciators are needed. We believe that control room indications which now exist, and which will exist a planned cation has been completed, provide the operators with sufficient tion to monitor the status of the DC power system. A discussion of our review findings is enclosed.

Robert A Vincent Staff Licensing Engineer CC Director, Region III, USNRC NRC-Resident Inspector,;..

Palisades I 8107220100 810714. I PDR 05000255 , P PDR *-*--*--_______ .,. \

., ,.. ' 1 ENCLOSURE

--Review of-SEP Technical Eva.J.-uation

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Topic VIII-3. B ----------

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"DC Power System Bus Voltage Monitoring and Annunciation" Palisades Plant The objective of this review is not only to determine whether the NRC's Technical Evaluation (TE) is applicable but also to determine if the de power system at Palisades is in conformance with the standards and guides which currently exist. According to Page 1 of the subject TE, the NRC derived specific requirements for the de power system monitoring and annunciation from the general ments embodied in Sections 5.3.2(4), 5.3.3(5) and 5.3.4(5) of IEEE 308-1974 and in Regulatory Guide 1.47. The specific requirements, as derived by the NRC and itemized in Section 2.0 of the TE, consist of eleven parameters.

According to the TE, the status of each of these parameters is to be displayed in the control room. The TE, however, offers no specific justification or basis for the selection of each of these eleven parameters for control room display. It appears as though these parameters were arbitrarily chosen as a result of an internal NRC memorandum, PSB (Rosa) to SEPB (Crutchfield), "DC System Monitoring and Annunciation," dated October 16, 1979. Consumers Power Company does not have a: copy of this memorandum for its review. The existing de power system monitoring and annunciation at Palisades complies with the industry guidelines which were in effect at the time the plant was constructed and is still in compliance with the requirements of IEEE 308-1974 and Regulatory Guide 1.47. The only, specific requirements, either stated or implied in these documents, are breaker position (RG 1.47 and IEEE 308-1974) and battery charger output voltage and current (IEEE 308-1974).

The remainder of the .items listed as required by the TE are not specifically required by either the standard or the guide. As a matter of fact, neither the standard nor the guide requires any control room monitoring or annunciation at all. It should be noted that IEEE 308-1974 is no longer current. A subsequent revision, namely IEEE 308-1978, has been approved for use. Even the 1978 revision does not require some of the monitoring and annunciation functions as required by the TE. In more recent correspondence, the NRC has reduced the list of parameters for which a status display is required in the control room (refer to letter: D M Crutchfield to D P Hoffman, May 26, 1981, "SEP Topic VIII-3.B, DC Power System Bus Voltage Monitoring and Annunciation, Safety Evaluation

• foi" The new requirements are that, as a minimum, the following indications and alarms be provided in the control room: nu0781-0150a-43

• • 2 1. Ba!_tery current (ammeter -

2. Battery charger output current (ammeter), 3. DC bus voltage (voltmeter), 4. DC bus ground alarm (for ungrounded system), 5. Battery breaker(s) or fuse(s) open alarm, and 6. Battery charger output breaker(s) or fuse(s) open alarm. As in the TE, no justification or basis was provided for the selection of these parameters or, for that matter, the deletion of certain other parameters from the original list of eleven. In an attempt to evaluate the*ability of the Palisades de power system monitoring and annunciation schemes to conform to the current, applicable standards and guides, the schemes were compared to the requirements set forth in IEEE 308-1978, IEEE 279-1 1971 and Regulatory Guide 1.47. Section 7.1 of IEEE 308-1978 "Class lE Power Systems for Nuclear Generating Stations," provides the surveillance requirements for Class lE power systems. The requirements are listed in the paragraphs below. IEEE 308-1978, Paragraph 7.1.1: "Operational status information shall be provided for Class lE power systems. The extent, selection and application of the various surveillance methods, including periodic testing, to indicate the operational status of Class lE power systems will depend on individual plant design requirements." IEEE 308-1978, Paragraph 7.1.2: "Class lE power systems required to be controlled from outside the main control room shall also have operational status information provided outside the central control room (for example, at the equipment itself, at its power supply or at an alternate central location)." IEEE 308-1978, Paragraph 7.1.3: "The operator shall be provided with accurate, complete, and timely information pertinent to the status of a protective action system. This --information shall be provided in the main control room and shall include indication of protective actions and protective action system bility* II Regulatory Guide 1.47 "Bypassed and Inoperable Status Indication for Nuclear Power Plant Safety Systems" references Criterion XIV of Appendix B to 10 CFR Part 50 which states that: nu0781-0150a-43

" ..... measures be established for indicating the operating status of systems, and components of the nuc-lear-power* plant,* such as by tagging valves and switches, to prevent inadvertent tion." Regulatory Guide 1.47 also references IEEE 279-1971, "Criteria for Protection Systems for Nuclear Power Generating Stations," Paragraph 4.13 which states: "If the protective action of some part of the system has been bypassed or deliberately rendered inoperative for any purpose, this fact shall be continuously indicated in the control room." 3 Part C of Regulatory Guide 1.47 provides an acceptable method for implementing the requirements of IEEE 279-1971, Paragraph 4.13 and Appendix B to 10 CFR Part 50 for safety-related system support systems such as the de system at Palisades.

Part C states the following:

1. "Administrative procedures should be supplemented by a system that automatically indicates at the system level the bypass or deliberately induced inoperability of the protection system and the systems actuated or controlled by the protection system." 2. "The indicating system of C.l. above should also be activated automatically by the bypassing or deliberately induced operability of any auxiliary or supporting system that effectively bypasses or renders inoperable the protection system and the systems actuated or controlled by the protection system." 3. "Automatic indication in accordance with C.1. and C.2. above should be provided in the control room for each bypass or deliberately induced inoperable status that meets all of the following conditions:

a. Renders inoperable any redundant portion of the protection system, systems actuated or controlled by the protection system, and auxiliary or supporting systems that must be operable for the protection system and the systems it actuates to perform their safety-related functions;

b. Is expected to occur more frequently than once per year; and c. Is expected to occur when the affected system is normally required to be operable." __ 4. -"Manual capability should exist in the control room to activate each system-level indicator provided in accordance with C.1. above." At Palisades, the entire de power system (ie, chargers, inverters, batteries and breakers) are controlled locally. In accordance with IEEE 308-1978, nu0781-0150a-43 Paragraph 7.1.2, the operational status information is displayed locally (see attached Drawing E-8). This information presently_

com?:i,sts of: a. Battery current (ammeter -charge/discharge);

one per battery, b. Battery charger output current (ammeter);

one per charger, c. Battery charger output voltage (voltmeter);

one per charger, d. DC bus voltage (voltmeter);

one per bus, e. DC bus ground current detector (milliammeter);

one per bus, and f. DC bus average ground current (recorder);

one per bus. 4 -All of the above indications are centrally located. Items b and c are located on the charger's front cabinet door. The remaining items are located on metering panels which are installed within approximately ten feet of the charger. In accordance with IEEE 308-1978, Paragraph 7.1.3, IEEE 279-1971, Para-graph 4.13 and Part C of Regulatory Guide 1.47, administrative procedures and automatic control room display are presently installed, or are planned to be installed, at Palisades.

These procedures and displays are, or will be placed, in service to provide the operator a complete and timely indication of system protective actions and system unavailability (such as deliberate actions to render inoperable, a component of the de power system). At Palisades, three control room annunciations are presently provided to alert the operator of de power system unavailability (see Drawing E289-4, attached).

The first annunciation is that for de bus undervoltage.

An undervoltage condition on either de bus (Bus 1 or Bus 2) will energize the alarm. Upon receiving the alarm (which is presently set for 120 V de), an operator can be dispatched to the local metering panel to determine which bus is affected utilizing voltmeter indication should it not already be apparent in the control room. The second annunciation presently installed at the plant is for battery chargers power off. This control room alarm will occur whenever power is lost on any one of the four chargers.

Upon receiving the alarm, an operator can be dispatched to the battery chargers to determine which charger is affected utilizing the charger's'voltmeter and ammeter indications, should it not already be apparent in the control room. The third control room alarm at Palisades is that for 125 V de bus ground.

the_ bus-to-ground current (milliamperes) on either bus exceed a predetermined set point, a control room alarm will be energized.

At this point, an operator can be dispatched to the local metering panels to determine which bus is grounded by utilizing the local milliammeters.

nu0781-0150a-43 5 As shown on Drawing E-138-1 (attached), the present de bus undervoltage alarming system will be modified to provide additional information-.*

-Upcoming refueling outage modifications will result in former 11 125 V DC Bus Undervoltage" alarm becoming a "125 V DC Bus Undervoltage/Trouble" alarm which will annunciate upon: 1. 125 V de bus tie breaker open (both buses), 2. PA system inverter loss of voltage (Bus DlO only), 3. Battery undervoltage (both batteries), and 4. 125 V de bus loss of voltage (both buses; this is the former alarm input). The three new alarm inputs (Items 1 through 3 above) will be provided by new de system unavailability detectors to be installed during the upcoming refueling outage. Alarm Input 1 (above) will result from a new tie breaker position switch which will be installed on both Bus DlO and D20 tie breakers.

Should either (or both) tie breakers be opened, the position switch "a" contacts will energize an auxiliary relay to effect both a control room and a local annunciation.

Alarm input No 2 will result from a new undervoltage relay installed to monitor the input of the public address system inverter.

Should this relay sense an undervoltage condition, both a control room and a local alarm will occur. Alarm input No 3 will result from a new undervoltage relay installed between the battery and the battery's downstream 1200 A fused disconnect.

Two relays will be installed, one for each battery (see Drawing E-8). The undervoltage relays will inform the Control Room Operator whenever the batteries are connected from the chargers (eg, the charger feeder breakers or the battery disconnects are open). The undervoltage alarm is set for 125.V de. This set point was chosen since the batteries normally "float" on the charger at 129 V de. Upon disconnecting the battery from its charger, the voltage drops to 122 V de. By providing a control room and local alarm at this voltage, the operator is alerted to a system unavailability condition in a timely manner. As previously mentioned, the three new inputs to the control room alarm also provides a local alarm. Upon control room annunciation of 11 125 V de Bus Undervoltage/Trouble," an operator can be dispatched locally to determine which of the four inputs provided the alarm and on which de system the problem has occurred; ie, Bus System DlO (Scheme D239) or Bus System D20 (Scheme D240). Drawing E138-1 shows a local annunciation relay for each system. Each relay indicates which alarm input caused the control room annunication.

In addition to the above de bus monitoring devices, there are alarms and indicators associated with the 120 V ac preferred power panels. Since the preferred power panels take their normal power supply from the de buses, the following alarms could be a further indication of de bus failure: nu0781-0150a-43

> 1. Preferred bus undervoltage

-control room alarm* (one per bus). 2 .-Ammeter (current input to -inverter)

-local indicator.

3. Ammeter (current out of inverter)

-local indicator.

4. Frequency meter -local indicator.

5. Ground detector -control room alarm* (one per bus). 6. Voltage meter -local indicator.

• A common alarm (one per bus) sounds indicating "preferred ac bus trouble" (see E289-4). It should be noted that the preferred power panel (inverter) de A, ac A and ac V are also recorded daily. Upon completion of the upcoming modifications, the control room will feature an assortment of de power system alarms (ie, "Battery Chargers Power Off," "125 V de Bus Ground," and "125 V de Bus Undervoltage/Trouble" and "*Preferred ac Bus Trouble." The proper combination of these alarms will alert the operator of most conceivable malfunctions, misalignments or maladjustments which might occur to render any part of the system inoperable.

Upon being alerted, the control room can dispatch an locally to specifically determine what the problem is and what system components may be affected.

Examples of the more probable conditions which could render the system inoperable are itemized below. 6 1. Should either tie breaker be opened or a charger feeder breaker be opened such that a battery is completely supplying the load, the new battery undervoltage relay will provide an alarm locally and to the control room. The alarm will also occur if the battery fused disconnect is opened. In all cases, the battery terminal voltage will fall below the undervoltage relay setpoint of 125 V de and the control room would be alerted as to the system unavailability per IEEE 308-1978, Paragraph 7.1.3 and Regulatory Guide 1. 47. 2. During a design basis accident (DBA) in which a diesel generator fails to function, a failure of the batteries to supply adequate power is indicated by the bus undervoltage alarm. This alarm occurs at 120 V de. 3. During a DBA in which the diesel generators do start and supply adequate power to the chargers, a determination as to whether the chargers or the battery is actually carrying the load (ie, battery current "in" or "out") is not of paramount importance as long as the loads are adequately supplied.

Aqequacy of the 125 V de supply would be apparent in that the "125 V de Bus Undervoltage/Trouble" alarm would not be energized (no undervoltage condition on the bus). As a result, a control room bus voltage voltmeter, a battery current ammeter or a charger ammeter would not be required.

Should a charger fail, however, a "Battery Charger Power Off" alarm will occur. At approximately the same time, the 11 125 V de Bus nu0781-0150a-43

-* . 7 Undervoltage/Trouble" alarm will occur as a result of the battery voltage dropping below its float level. A local "Bus Loss of Voltage" voltage) alarm will -occur thereafter when the battery's terminal voltage drops below 120 V de during the discharge.

The aforementioned sequence of alarms will provide a clear account of the de power system performing its protective action as required in IEEE 308-1978, Paragraph

7.1.3. Prior

to the DBA, the Control Room Operator has a high degree of confidence in the ability of the de power system to perform its intended function in the event of an accident.

This confidence is based on the fact that none of the aforementioned alarms are normally energized.

In other words, the system is properly aligned for protective service and the-system voltage levels are adequate.

In support of the information obtained as a result of these alarms not being energized, the operator's confidence in the system is further hanced by the DC Power System Data Collection Program. This program provides a daily check on the operability condition of the batteries themselves.

This data collection program requires that the following parameters be logged daily: 1. Battery float voltage (voltmeter, each battery) 2. Battery current (ammeter, each battery) 3. Battery pilot cell temperature (thermometer, each battery) 4.

pilot cell specific gravity (hydrometer), each battery) 5. Battery pilot cell electrolyte level (observation, each battery) 6. Battery pilot cell voltage (test voltmeter, each battery) In addition to logging these parameters, an operator is dispatched to the battery chargers and metering panels on a shift basis for a general inspection of the de power system status as indicated by the instrumentation described in Items a through f on Page 4 above. As a result of the aforementioned control room alarming system (as mented by a more detailed local alarming system) and da{ly battery and de power system evaluations, the operator can be continually aware (from the control room) of the availability status of the de power system. In addition, the states of the control room alarms provide a direct indication that the system is performing its intended function during an accident.

The Consumers Power Company, therefore, is confident that the intent of IEEE 279-1971, IEEE 308-1978 and Regulatory Guide 1.47 is being met at Palisades.

It is the belief of Consumers Power Company that the installation of additional control ro_om _metering such as de bus voltmeters, battery ammeters and charger ammeters (it should again be noted that a de bus ground alarm is already installed and proper alignment of the battery disconnects, charger breakers and the bus tie breakers will be monitored by the undervoltage relays to be installed) is unwarranted.

The utility of this additional metering is extremely low since nu0781-0150a-43

-* *

• I) it would provide the operator very limited additional useful information during normal or _emergency conditions.

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