ML20157A128

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IP-EP-510, Revision 8, Meteorological, Radiological, & Plant Data Acquisition System
ML20157A128
Person / Time
Site: Indian Point  Entergy icon.png
Issue date: 05/14/2020
From: Martin R
Entergy Nuclear Operations
To:
Office of Nuclear Reactor Regulation
References
IP-EP-510, Revision 8
Download: ML20157A128 (15)
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Text

---Entergy Indian Point Energy Center CONTROLLED DOCUMENT Document Control TRANSMITTAL 450 Broadway Buchanan, NY 10511 TO: DISTRIBUTION DATE: 6/1/2020 FROM: IPEC DOCUMENT CONTROL - 3RD FLOOR ADMIN BLDG PHONE#:

TRANSMITTAL#: EP-20-0020 The Document(s) identified below are forwarded for use. Please review to verify receipt, incorporate the document(s) into your controlled document file, properly disposition superseded, voided, or inactive document{s).

AFFECTED DOCUMENT IPEC EMERGENCY PLANNING PROCEDURES DOC # I REV# I TITLE I INSTRUCTIONS THE FOLLOWING PROCEDURE($) HAS BEEN REVISED, PLEASE REMOVE YOUR CURRENT COPY AND REPLACE WITH ATTACHED UPDATED REVISION:

IP-EP-510 REVISION 8 4 c;,e,J J?RA-l 'RECO(l.!>.S EFFECTIVE DATE: 6/1/2020 RECEIPT OF THE ABOVE LISTED DOCUMENT(S) IS HEREBY ACKNOWLEDGED. I CERTIFY THAT ALL SUPERSEDED, VOID, OR INACTIVE COPIES OF THE ABOVE LISTED DOCUMENT(S) IN MY POSSESSION HAVE BEEN REMOVED FROM USE AND ALL UPDATES HAVE BEEN PERFORMED IN ACCORDANCE WITH EFFECTIVE DATE(S)

(IF APPLICABLE) AS SHOWN ON THE DOCUMENT{S).

Ir-----------------~\

! U.S. NUCLEAR REGULATORY COMMISSION I

ATTN: DOCUMENT CONTROL DESK D

I 11555 ROCKVILLE PIKE.

ROCKVILLE, MD 20852 NAME (PRINT) SIGNATURE DATE COPY LOCATION

Attachment 1 Page 1 of 2 10CFR50.54(Q 1(2) Review Procedure/Document Number: IP-EP-510 Revision: 8 Equipment/Facility/Other: Indian Point Energy Center

Title:

Meteorological, Radiological, & Plant Data Acquisition System Part I. Description of Activity Being Reviewed (event or action, or series of actions that have the potential to affect the emergency plan or have the potential to affect the implementation of the emergency plan):

Procedure was revised, to reflect the requirement in the Post Unit 2 Shutdown Eplan (PSEP), as submitted to the NRC per LAR, license #NL-19-001. See attached matrix for changes made. Procedure will be effective on June 1, 2020, Part II. Emergency Plan Sections Reviewed (List all emergency plan sections that were reviewed for this activity by number and title. IF THE ACTIVITY IN ITS ENTIRETY IS AN EMERGENCY PLAN CHANGE, EAL CHANGE OR EAL BASIS CHANGE, ENTER THE SCREENING PROCESS. NO 10CFR50.54(q)(2) DOCUMENTATION IS REQUIRED.

Part 1

Introduction:

Section A: Purpose Part 2 Planning Standards and Criteria:

Section A: Assignment of Responsibility Section 8: Station Emergency Response Organization Section H: Emergency Facilities and Equipment Part Ill. Ability to Maintain the Emergency Plan (Answer the following questions related to impact on the ability to maintain the emergency plan):

1. Do any elements of the activity change information contained in the emergency plan (Section 3.0 Step 6)?

YES D NO [8J IF YES, enter screening process for that element

2. Do any elements of the activity change an emergency classification Initiating Condition, Emergency Action Level (EAL), associated EAL note or associated EAL basis information or their underlying calculations or assumptions?

YES D NO [8J IF YES, enter screening process for that element

3. Do any elements of the activity change the process or capability for alerting and notifying the public as described in the FEMA-approved Alert and Notification System design report?

YES D NO [8J IF YES, enter screening process for that element

4. Do any elements of the activity change the Evacuation Time Estimate results or documentation?

YES D NO [8J IF YES, enter screening process for that element

5. Do any elements of the activity change the Onshift Staffing Analysis results or documentation?

YES D NO [8J IF YES, enter screening process for that element EN-EP-305 ROOS

Attachment 1 Page 2 of 2 10CFR50.54(Q 1(2) Review Procedure/Document Number: IP-EP-510 Revision: 8 Equipment/Facility/Other: Indian Point Energy Center

Title:

Meteorological, Radiological, & Plant Data Acquisition System Part IV. Maintaining the Emergency Plan Conclusion The questions in Part Ill do not represent the sum total of all conditions that may cause a change to or impact the abrnty to maintain the emergency plan. Originator and reviewer signatures in Part V document that a review of all elements of the proposed change have been considered for their impact on the ability to maintain the emergency plan and their potential to change the emergency plan.

1. Provide a brief conclusion that describes how the conditions as described in the emergency plan are maintained with this activity.
2. Check the box below when the 10CFR50.54(q)(2) review completes all actions for all elements of the activity- no 10CFR50.54(q)(3) screening or evaluation is required for any element. Otherwise, leave the*checkbox blank.

1'8] I have completed a review of this activity in accordance with 10CFR50.54(q)(2) and determined that the effectiveness of the emergency plan is maintained. This activity does not make any changes to the emergency plan. No further actions are required to screen or evaluate this activity under 10CFR50.54(q)(3).

Per Post Shutdown Emergency Plan (PSEP), Unit 3 CCR will be the active/running plant and Unit 2 will be at shut down. The changes made to this procedure (see attached matrix) reflects this requirement of the Post Unit 2 Shutdown Eplan, as submitted to the NRC (license# NL-19-001).

The NRC has approved the PSEP per RA-20-040.

A review of this activity in accordance with 10 CFR 50.54(q)(2) has been completed and determined that the effectiveness of the PSEP is maintained. This revision aligns the procedure with the protocols of the post Unit 2 shutdown. None of the changes affect the ability to perform classifications, notifications, or PARs, it does not affect activation or staffing of the ERO, and all planning standard requirements are maintained. The changes made do not require a change to the Emergency Action Level scheme, On-shift Staffing study or the PSEP.

No further actions are required to screen or evaluate this activity under 10 CFR 50.54(q)(3).

Part V. Signatures:

Preparer Name (Print) Preparer Signature Date:

Rebecca A. Martin

~"Cty\ll~ 5/14/2020

{Optional) Reviewer Name (Print) Reviewer Signature Date:

Reviewer Name (Print) Reviewer Signature Date:

Timothy Garvey Nuclear EP Project Manager

(),{tc,cq~ (\ {Vl~ -611, to<<, u-i!l-\ 5/14/2020 Approved Per Telecom Approver Name (Print) Approver Signature Date:

Frank Mitchell Emergency Planning Manager or designee EN-EP-305 R008

IP-EP-510 Revision 8 REVISION MATRIX Change Page/Section Previous Version New Version Editorial Effect on 10 CFR 50.47(b)

No. Change Planning Standards or NU REG-

- 0654 program elements? Justify if NO.

1. Page 5 Section 5.1.2 5.1.2.1 EOF/AEOF: Call Unit 3 CR, N N this section discusses a 5.1.2.1 EOF/AEOF: Call Unit 2 or identify yourself and ask for the 1Om met back-up method to the primary 3 CR, identify yourself and ask for tower elevation wind speed, wind system to obtain 1Om MET data.

the 1Om met tower elevation wind direction and Pasquill Category. Unit 2 No changes are made other than speed, wind direction and CR may also be called; however, they if they try to contact Unit 2 for Pasquill Category.

may not be readily available. data, they may not be available with limit resources as per Post Shutdown Emergency Plan, which was approved by the NRC per RA-20-040.

2. Page 5 Section 5.1.2 CR: Obtain data from MRPDAS using a N N - this section discusses a 5.1.2.2 CR: Obtain data from personal computer (see 5.1.1.2) or call back-up method to the primary MRPDAS using a personal the other unit's Control Room for MET system to obtain 1Om MET data.

computer (see 5.1.1.2) or call the data. Unit 2 may not be readily available. No changes are made other than other unit's Control Room for if they try to contact Unit 2 for MET data.

data, they may not be available with limit resources as per Post Shutdown Emergency Plan, which was approved by the NRG per RA-20-040.

Page 1 of 1

IPEC NON-QUALITY RELATED EMERGENCY PLAN IP-EP-AD2 Revision 12 PROCEDURE

-- Entergy ADMINISTRATIVE PROCEDURES REFERENCE USE Page 1 of 1 Attachment 9.1 Emergency Planning Document Change Checklist Form (All sections must be completed, NIA or place a check on the line where applicable)

Section 1 Doc/Procedure Type:

Administrativen Implementing [XJ EPLAN n NIA Doc/Procedure No: IP-EP-510 Doc/Procedure

Title:

Meteorological, Radiological & Plant Data Acquisition New revision number: 8 Corrective Action: Yes t8l No N/A CR#: OL-OLl-2018-00090 CA 18 Effective date: . June 1, 2020 Section 2 Change Description

1. Ensure the following*are completed, or are not applicable and are so marked:
a. 50.54q NIA
b. EN-FAP-OM-023 NIA
c. IP-SMM-AD-102 NIA
d. OSRC NIA~
e. NRC Transmittal N/A~

(within 30 days)

2. List any other documents affected by this chang/ NIA
3. Transmittals are completed: D N/A lgj Date: S l<j /ac>'JiD
4. Ensure the proper revision is active in eB Ref. Lib.:~ N/A D
5. Approved doc/procedure delivered to Doc. Control for distribution: D NIA~ Date:5./ao/~o;;~p
6. Position Binders updated: D NIA 00 Date: .!!dJ_..,,p"J..o
7. Copy of EPDCC placed in EP file: 0 NIA' Date: _ _
8. Supporting documentation is submitted as a general record in eB Ref. Lib.: D NIA I&] Date: s/41>/d,.D:J.6
9. Word files are move/ zm working drafts folder to current revision folder in the EP drive:

0 NIA'fi9_ Date: 0 I b'J,D J

Sheet 1 of 1

IP-SMM-AD-102 Rev:17 IPEC IMPLEMENTING PROCEDURE Page 35 of 43 PREPARATION, REVIEW, AND APPROVAL ATTACHMENT 10.2 IPEC PROCEDURE REVIEW AND APPROVAL (Page 1 of 1) procedure

Title:

Meteorological, Radiological & Plant Data Acquisition System Procedure No* JP-EP-510 Existing Rev* 7 New Rev* 8 ORN/EC No* DRN-20-00310 Procedure Activitv Tem(;!ora!)l Procedure Change (MARK Applicable) D Converted To IPEC, Replaces: (MARK Applicable)

D NEW PROCEDURE Unit 1 Procedure No: D EDITORIAL Temporary Procedure Change D GENERAL REVISION

@ PARTIAL REVISION Unit 2 Procedure No: D ADVANCE Temporary Procedure Change D EDITORIAL REVISION D CONDITIONAL Temporary Procedure Change D VOID PROCEDURE Terminating Condition:

Unit 3 Procedure No:

D SUPERSEDED RAPID REVISION Document in Microsoft Word:

D Yes D No D VOID DRNffPC No(s):

Revision Summa!)£ D NIA - See Revision Summary Matrix Implementation Requirements Implementation Plan? D Yes l!l No Formal Training?[&] Yes No Special Handling? Yes l!l No RPO Dept Emergency Planning Writer (Print .x n: Re rtin/x7106/ Re~(lyY}cv&-i Review and Approval (Per Attachment 10.1, !PEG Re

1. ~ Technical Reviewer: Kevin Robinson /  ; -r/
  • ldUJ
2. Cross-Disciplinary Reviewers:

Dept: _ _ _ _ _ _ Reviewer: _ _ _ _ _ _ _ ____,..,..__ _ _ _ _ ___,.._ _ _ _ _ _ _ __

(Print Name/ Signature/ Date)

Dept: _ _ _ _ _ _ Reviewer:--------,,=-=---=-,----,,..,,..,.----,---=---,----------

(Print Name/ Signature/ Date)

3. I!] ....~~...,,',ilt;)'-='-----

RPO- Responsibilities/Checklist: F. Mitchell_---,,U-,,_--='"-:-,-"="~::-'--'-'~~~'--,-=--a-=-*-~-Mi___.z;

'(Print Name/ Signature/ Date) l!l PAD required and is complete (PAD Approver and Reviewer qualifications have been verified)

D Previous exclusion from further Ll-100 Review is still valid D PAD not required due to type of change as defined in 4.6

4. Non-Intent Determination Complete: -------=-~-=-=---,-,,.,---...,..,,,----,-----,--------

(Print Name/ Signature/ Date)

NO change of purpose or scope NO change to less restrictive acceptance criteria NO reduction in the level of nuclear safety NO change to steps previously identified as commitment steps NO voiding or canceling of a procedure, unless NO deviation from the Quality Assurance Program Manual requirements are incorporated into another procedure NO change that may result in deviations from Technical or the need for the procedure was eliminated via an Specifications, FSAR, plant design requirements or previously alternate process. made commitments.

5. On-Shift Shift Manager/CRS:

(Print Name/ Signature/ Date)

6. User Validation: User:
7. Special Handling Requirements Understood:

IPEC NON-QUALITY IP-EP-510 Revision 8 AE~

= llil¥gy@ EMERGENCY PLAN RELATED PROCEDURE IMPLEMENTING PROCEDURES REFERENCE USE Page 1 of 9 LLE Meteorological, Radiological

& Plant Data Acquisition System

  • Prepared by:

Approval:

Rebecca A. Martin Print Name Frank J. Mitchell Rttecc{A0i\Mu~

//N~

Signature

r-/;o-1~

Date

~___,w1~:J-6 Print Name Signature Date Effective Date: June 1, 2020 IP-EP-51 O(MRPDAS)RB. doc

  • ~

IPEC NON-QUALITY IP-EP-510 Revision 8 EMERGENCY PLAN

  • go Er1lergy RELATED PROCEDURE IMPLEMENTING PROCEDURES REFERENCE USE Page 2 of 9 Table of Contents 1.0 PURPOSE .............................................................................................................. 3 2.0 RERFERENCES ..................................................................................................... 3 3.0 DEFINITIONS ......................................................................................................... 3 4.0 RESPONSIBILITIES ............................................................................................... 3 5.0 DETAILS ................................................................................................................. 4 5.1 Obtaining Meteorological Data ..................................................................... 4 5.2 Obtaining Reuter Stokes and Selected Plant Parameter Data ..................... 5 6.0 INTERFACES ......................................................................................................... 6 7.0 RECORDS .............................................................................................................. 6
  • 8.0 REQUIREMENTS AND COMMITMENT CROSS-REFERENCE ............................ 6 9.0 ATTACHMENTS

9.1 Example

MRPDAS Meteorological Data Report .......................................... 7 9.2 Pasquill Category vs. Temperature Change Between 60m and 10m ........... 8 9.3 Estimation of Pasquill Category .................................................................... 9

~

IPEC NON-QUALITY IP-EP-510 Revision 8 EMERGENCY PLAN g Entergy* IMPLEMENTING RELATED PROCEDURE PROCEDURES REFERENCE USE Page 3 of 9 Meteorological, Radiological & Plant Data Acquisition System 1.0 PURPOSE 1.1 This procedure describes the methods available to obtain meteorological, Reuter Stokes and selected plant parameter data in the Control Rooms (CRs),

the Emergency Operating Facility (EOF) and/or the Alternate Emergency Operating Facility (AEOF).

2.0 REFERENCES

NONE 3.0 DEFINITIONS Meteorological, Radiological & Plant Data Acquisition System (MRPDAS) - system that provides meteorological, radiological and certain plant parameter data i.e.: R-27, R-25/26, VC Pressure and VC Temperature.

  • 4.0 RESPONSIBILITIES The Unit 2 and Unit 3 Control Room, and the EOF Radiological Assessors are responsible for the implementation of this procedure .

,.a IPEC NON-QUALITY IP-EP-510 Revision 8

~E'.

= . .11Lergy EMERGENCY PLAN RELATED PROCEDURE IMPLEMENTING PROCEDURES REFERENCE USE Page 4 of 9 5.0 DETAILS 5.1 Obtaining Meteorological Data:

5.1.1 Primary Methods:

5.1.1.1 Control Room (CR):

a. Use the 1Om elevation meteorological tower display panel to obtain wind speed, wind direction and Pasquill Category.

5.1.1.2 Emergency Operations Facility (EOF)/Alternate EOF (AEOF):

a. Use MRPDAS to access the information from the 10m met tower elevation -wind speed, wind direction and Pasquill Category.
b. From the IPEC Sharepoint Website, pull down the
  • Applications menu .

C. Double-click the MRPDAS icon to access the MRPDAS program (Plant screen appears).

d. Select one of the following from left column under "Entergy IPEC": "Drill Data" or "Live Data"
e. Select - "Common" - "Meteorological Data" Select- "Primary MET Display"
f. Read the reports from the display; or click the printer icon displayed in the top left corner of the Primary MET Display screen. Click "Print" button in the "Print" window.
g. Obtain the latest measured MET data every 15 min.

and obtain weather forecast from MRPDAS and/or Weather Bureau.

1. Update the MET Data Status Board to display the correct data.
2. Notify the Radiological Assessment Coordinator of any significant changes to the MET data .
  • h. To exit MRPDAS, click on the red X at the top right of the screen.

IPEC NON-QUALITY IP-EP-510 Revision 8 EMERGENCY PLAN

-g§'Ei1lergy'!> IMPLEMENTING RELATED PROCEDURE PROCEDURES REFERENCE USE Page 5 of 9 5.1.2 Back-up methods:

5.1.2.1 EOF/AEOF: Call Unit 3 CR, identify yourself and ask for the 1Om met tower elevation wind speed, wind direction and Pasquill Category. Unit 2 CR may also be called; however, they may not be readily available.

5.1.2.2 CR: Obtain data from MRPDAS using a personal computer (see 5.1.1.2) or call the other unit's Control Room for MET data. Unit 2 may not be readily available.

5.1.2.3 Obtain data from Offsite Weather Services

a. Use the Emergency Telephone Directory to locate the offsite weather services phone numbers.
b. AccuWeather - use personal computer to log on to offsite weather services web. Select AccuWeather:

www.accuweather.com and enter "Buchanan, NY" or

  • "10511" in Search Bar and click "ENTER" .
c. National Weather Service (NWS) - select National Weather Service: www.weather.gov and enter "Buchanan, NY" or "10511" for "Local Forecast, City, St". Click "GO".

5.1.2.4 Use Attachment 9.2 to estimate Pasquill Category by using the temperature change between 60 m and 10 m.

5.1.2.5 Use Attachment 9.3 to estimate Pasquill categories based on weather conditions in case the met tower data is unavailable.

5.2 Obtaining Reuter Stokes and Selected Plant Parameter Data 5.2.1 From the IPEC Sharepoint Website, pull down the Applications menu.

5.2.2 Double-click the MRPDAS icon to access the MRPDAS program (Plant screen appears).

5.2.3 Select one of the following from left column under "Entergy IPEC": "Drill Data" or "Live Data".

  • 5.2.4 Select "Common" .

5.2.5 Select "Reuter Stokes Data" and "5 Mile Radius Map".

  • ~ IPEC NON-QUALITY IP-EP-510 Revision 8

=E~

-=- nlergy EMERGENCY PLAN RELATED PROCEDURE IMPLEMENTING PROCEDURES REFERENCE USE Page 6 of 9 5.2.6 Select "Data Summary Report" (see Attachment 9.1 for example report) under "Common" or other Plant Parameter reports under "Unit 2" or "Unit 3".

6.0 INTERFACES IP-EP-310, Dose Assessment 7.0 RECORDS NONE 8.0 REQUIREMENTS AND COMMITMENT CROSS-REFERENCE NONE 9.0 ATTACHMENTS

9.1 EXAMPLE

MRPDAS METEOROLOGICAL DATA REPORT

  • 9.2 9.3 PASQUILL CATEGORY VS TEMPERATURE CHANGE BETWEEN 60m AND10m ESTIMATION OF PASQUILL CATEGORY

,A. IPEC NON-QUALITY IP-EP-510 Revision 8 EMERGENCY PLAN g, hnlc.>rgy IMPLEMENTING RELATED PROCEDURE PROCEDURES REFERENCE USE Page 7 of 9 Attachment 9.1 EXAMPLE: MRPDAS METEOROLOGICAL DATA REPORT Sheet 1 of 1 NOTE:

All "9s" in a data field indicates the data was not collected.

      • DAILY

SUMMARY

REPORT ***

      • DATE: 05/29/2002 07:10 ***

TIME *** MET TOWER DATA (M/S,DEG FROM,F) ***

HRMN (EST) SPD10M SPD60M DIR10M DIR60M DT60 DT122 PC 0700 2.2 3.3 2 15 -1.2 -2.1 D

      • UNIT #2 PLANT PARAMETER DATA***

VG VG VG VG VG VENT P948A P948B T1203 R-25 R-26 R-27 (PSIG) (PSIG) (F) (R/HR) (R/HR) (UCI/SEC)

-.2 .0 1.02E+02 <=1.00E+00 <=1.00E+00 2.53E+02

      • UNIT #3 PLANT PARAMETER DATA***

CONT CONT DOME RAD VENT (PSIG) (F) (R/HR) (UGI/SEC)

-.1 94 <=1.0E+00 1.0E+01

      • ATMOSPHERIC DISPERSION***

SITE BOUNDARY DIST= .6 MILES 2 MILES 5 MILES 10 MILES XU/Q XU/Q XU/Q XU/Q (1/M2) (1/M2) - (1/M2) (1/M2) 1.0E-04 1.9E-05 5.1E-06 2.1E-06

      • OFFSITE MONITOR DATA***

MON NO 1 2 3 4 5 6 7 8 SECTOR N NNE NE ENE E ESE SE SSE RAD (MR/HR) 3.4E-03 6.9E-03 6.8E-03 7.0E-03 6.3E-03 7.3E-03 7.9E-03 7.4E-03 MON NO 9 10 11 12 13 14 15 16 SECTOR s SSW SW WSW w WNW NW NNW RAD (MRHR) 8.5E-03 6.0E-03 5.9E-03 8.5E-03 1.1 E-02 6.5E-03 7.0E-03 8.4E-03

      • METEOROLOGICAL FORECAST***

HOUR SPEED (MPH) DIRECTION (FROM) RAIN STABILITY 17 0 5.8 130 YES D 18 0 4.9 50 YES D 19 0 4.5 30 YES D 20 0 4.0 0 YES D 21 0 3.6 350 NO D 22 0 3.6 340 NO D

IPEC NON-QUALITY IP-EP-510 Revision 8 A

-= Entergy EMERGENCY PLAN RELATED PROCEDURE IMPLEMENTING PROCEDURES REFERENCE USE Page 8 of 9 Attachment 9 .2 PASQUILL CATEGORY vs TEMPERATURE CHANGE BETWEEN 60m AND 1Om Sheet 1 of 1 PASQUILL TEMPERATURE CATEGORY CHANGE (OF)

A <-1.74 B -1.74 to <-1.56 C -1.56 to< -1.37 D -1.37 to <-0.46 E -0.46 to <+1.37 F +1.37 to .::_+3.66 G >+3.66

IPEC NON-QUALITY IP-EP-510 Revision 8 EMERGENCY PLAN

~E,lle,gyF, IMPLEMENTING RELATED PROCEDURE PROCEDURES REFERENCE USE Page 9 of 9 Attachment 9.3 ESTIMATION OF PASQUILL CATEGORY Sheet 1 of 1 Use this attachment to determine the Pasquill Category in the absence of both measured vertical temperature differences AND the standard deviation (sigma theta) for horizontal wind direction.

DEFINITION OF PASQUILL STABILITY CATEGORY PASQUILL CATEGORY STABILITY CONDITIONS A Extremely unstable B Moderately unstable C Slightly unstable D Neutral E Slightly stable F Moderately stable G Extremely stable

  • Pasquill category can be estimated by observir,g or estimating the time of day, solar radiation, cloudiness, and wind speed.

Surface Wind KEY TO STABILITY CATEGORIES DAYTIME NIGHT Speed (mis)

Incoming Solar Radiation Cloudiness (lnsolation)

Thinly Clear Partly Overcast Clear to Overcast or Sky Cloudy Partly Cloudy

>4/8 Low Cloud

<2 A A-8 B E-F G 2-3 A-8 B C E F 4-5 B 8-C C D E 5-6 C C-D D D D

>6 C D D D D General Definitions

1. Daytime is considered as one hour after sunrise to one hour before sunset.
2. (a) Clear sky - less than 20 percent cloud cover.
  • (b) Partly cloudy - 20 to 80 percent cloud cover.

(c) Overcast - 80 to 100 percent cloud cover.

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